知识大全 ①x+2y=3,② 1 x -3x=9 ,③ y-2 3 =y+ 1 3 ,④ 1
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在下列方程中:①x+2y=3,② 1 x -3x=9 ,③ y-2 3 =y+ 1 3 ,④ 1
①是二元一次方程; ②是分式方程; ③符合一元一次方程的定义; ④符合一元一次方程的定义. 故③④是一元一次方程. |
求极限:lim(2n∧3-3n^2 n 2)/(3n^3+2n-1) n趋于无穷
用N-ε语言
对于任意ε>0
存在N=max(1,5/2ε)
当n>N时
|(3n^2+n)/(2n^2-1)-3/2|
=|(6n^2+2n-6n^2+3)/[2(2n^2-1)]|
=(2n+3)/[2(2n^2-1)]
因为n>N>=1,所以2n+3<2n+3n=5n
2n^2-1>2n^2-n^2=n^2
(分子更大,分母更小的数更大)
<5n/[2(n^2)]
=5/2n
<5/2(5/2ε)
=ε
由极限定义
lim n->∞ (3n^2+n)/(2n^2-1)=3/2
下列各式计算正确的是( ) A.( 1 3 ) -3 =27 B.a 3 ?a 2 =a 6 C.(-2a 3 )
A、(
B、a 3 ?a 2 =a 5 ,错误; C、(-2a 3 ) -3 = -
,错误; |
天天酷跑3v3怎么玩 3v3团队战怎么获胜
亚瑟的攻击会造成额外的法术伤害
二技能,改为了在释放时能够继续释放技能一技能,且在该范围内的敌人会受到持续的魔法伤害,并对周围敌人造成持续伤害
三技能,取消了原来在技能释放时生成的护盾,修改成了在技能命中敌人后,原技能在释放是无法释放技能,该技能在原技能的基础上增加了技能命中后附带范围的击飞效果,回旋打击,誓约之盾,圣剑裁决,这个技能做了一个大改动
Al3++3H2O=Al(OH)3+3H+在平衡体系中加入NaOH
平衡正向移动?这种说法存在争议,但是殊途同归,正向与逆向的结果是一样的。
按照浓度大小,应先与Al3+反应,按照反应难易(离子结合的稳定性),应先与H+反应。
实际两者都存在。
理论上的争辩不影响该反应的结果。
(CH3)3COH转换成(CH3)3CCH2CH2OH
(CH3)3COH + PBr3 === (CH3)3CBr + Li ===(CH3)3CLi
(CH3)3CLi + HCHO === (CH3)3CCH2OH
(CH3)3CCH2OH + PBr3 ===(CH3)3CCH2Br
(CH3)3CCH2Br + Mg=== (CH3)3CCH2MgBr
(CH3)3CCH2MgBr + HCHO ===(CH3)3CCH2CH2OH
24点 3,3,5,8 2,4,7,7点解 一题多解 2,2,4,8 3,3,5,6
2, 4, 7, 7的24点答案:
1: (2 × (7 + 7)) - 4
2: 2 × (7 + 7) - 4
3: (7 + 7) × 2 - 4
4: ((7 + 7) × 2) - 4
2, 2, 4, 8的24点答案:
1: (2 + 2) × 4 + 8
2: ((2 + 2) × 4) + 8
3: 2 × 2 × 4 + 8
4: (2 × 2) × 4 + 8
5: (2 × 2 × 4) + 8
6: ((2 × 2) × 4) + 8
7: (2 × (2 × 4)) + 8
8: 2 × (2 × 4) + 8
9: (2 × (2 + 8)) + 4
10: 2 × (2 + 8) + 4
11: 2 × (2 × 8 - 4)
12: 2 × ((2 × 8) - 4)
13: (2 + 4) ÷ 2 × 8
14: ((2 + 4) ÷ 2) × 8
15: (2 + 4) ÷ (2 ÷ 8)
16: 2 × 4 + 2 × 8
17: (2 × 4) + 2 × 8
18: 2 × 4 +(2 × 8)
19: (2 × 4) + (2 × 8)
20: 2 × 4 × 2 + 8
21: (2 × 4) × 2 + 8
22: (2 × 4 × 2) + 8
23: ((2 × 4) × 2) + 8
24: (2 × (4 × 2)) + 8
25: 2 × (4 × 2) + 8
26: (2 + 4) × 8 ÷ 2
27: ((2 + 4) × 8) ÷ 2
28: (2 + 4) × (8 ÷ 2)
29: 2 × 4 + 8 × 2
30: (2 × 4) + 8 × 2
31: 2 × 4 +(8 × 2)
32: (2 × 4) + (8 × 2)
33: (2 + 8) × 2 + 4
34: ((2 + 8) × 2) + 4
35: (2 + 8 ÷ 2) × 4
36: (2 + (8 ÷ 2)) × 4
37: (2 × (8 + 2)) + 4
38: 2 × (8 + 2) + 4
39: 2 × 8 + 2 × 4
40: (2 × 8) + 2 × 4
41: 2 × 8 +(2 × 4)
42: (2 × 8) + (2 × 4)
43: 2 × (8 × 2 - 4)
44: 2 × ((8 × 2) - 4)
45: 2 × 8 + 4 × 2
46: (2 × 8) + 4 × 2
47: 2 × 8 +(4 × 2)
48: (2 × 8) + (4 × 2)
49: (2 × 8 - 4) × 2
50: ((2 × 8) - 4) × 2
51: 4 + (2 × (2 + 8))
52: 4 + 2 ×(2 + 8)
53: (4 + 2) ÷ 2 × 8
54: ((4 + 2) ÷ 2) × 8
55: (4 + 2) ÷ (2 ÷ 8)
56: (4 - 2 ÷ 2) × 8
57: (4 - (2 ÷ 2)) × 8
58: (4 × (2 + 2)) + 8
59: 4 × (2 + 2) + 8
60: 4 × 2 + 2 × 8
61: (4 × 2) + 2 × 8
62: 4 × 2 +(2 × 8)
63: (4 × 2) + (2 × 8)
64: 4 × 2 × 2 + 8
65: (4 × 2) × 2 + 8
66: (4 × 2 × 2) + 8
67: ((4 × 2) × 2) + 8
68: (4 × (2 × 2)) + 8
69: 4 × (2 × 2) + 8
70: 4 + (2 + 8) × 2
71: 4 + ((2 + 8) × 2)
72: 4 + (2 × (8 + 2))
73: 4 + 2 ×(8 + 2)
74: (4 + 2) × 8 ÷ 2
75: ((4 + 2) × 8) ÷ 2
76: (4 + 2) × (8 ÷ 2)
77: 4 × 2 + 8 × 2
78: (4 × 2) + 8 × 2
79: 4 × 2 +(8 × 2)
80: (4 × 2) + (8 × 2)
81: 4 × (2 + 8 ÷ 2)
82: 4 × (2 + (8 ÷ 2))
83: 4 + (8 + 2) × 2
84: 4 + ((8 + 2) × 2)
85: 4 × (8 ÷ 2 + 2)
86: 4 × ((8 ÷ 2) + 2)
87: 8 + (2 + 2) × 4
88: 8 + ((2 + 2) × 4)
89: (8 + 2) × 2 + 4
90: ((8 + 2) × 2) + 4
91: 8 + 2 × 2 × 4
92: 8 + (2 × 2) × 4
93: 8 + (2 × 2 × 4)
94: 8 + ((2 × 2) × 4)
95: 8 + (2 × (2 × 4))
96: 8 + 2 ×(2 × 4)
97: 8 × 2 + 2 × 4
98: (8 × 2) + 2 × 4
99: 8 × 2 +(2 × 4)
100: (8 × 2) + (2 × 4)
101: (8 ÷ 2 + 2) × 4
102: ((8 ÷ 2) + 2) × 4
103: 8 ÷ 2 ×(2 + 4)
104: (8 ÷ 2) × (2 + 4)
105: 8 ÷ (2 ÷ (2 + 4))
106: 8 + 2 × 4 × 2
107: 8 + (2 × 4) × 2
108: 8 + (2 × 4 × 2)
109: 8 + ((2 × 4) × 2)
110: 8 + (2 × (4 × 2))
111: 8 + 2 ×(4 × 2)
112: 8 × 2 + 4 × 2
113: (8 × 2) + 4 × 2
114: 8 × 2 +(4 × 2)
115: (8 × 2) + (4 × 2)
116: (8 × (2 + 4)) ÷ 2
117: 8 × (2 + 4) ÷ 2
118: 8 × ((2 + 4) ÷ 2)
119: (8 × 2 - 4) × 2
120: ((8 × 2) - 4) × 2
121: 8 ÷ 2 ×(4 + 2)
122: (8 ÷ 2) × (4 + 2)
123: 8 ÷ (2 ÷ (4 + 2))
124: 8 + (4 × (2 + 2))
125: 8 + 4 ×(2 + 2)
126: 8 + 4 × 2 × 2
127: 8 + (4 × 2) × 2
128: 8 + (4 × 2 × 2)
129: 8 + ((4 × 2) × 2)
130: 8 + (4 × (2 × 2))
131: 8 + 4 ×(2 × 2)
132: (8 × (4 + 2)) ÷ 2
133: 8 × (4 + 2) ÷ 2
134: 8 × ((4 + 2) ÷ 2)
135: 8 × (4 - 2 ÷ 2)
136: 8 × (4 - (2 ÷ 2))
3, 3, 5, 6的24点答案:
1: 3 + 3 × 5 + 6
2: (3 + 3 × 5) + 6
3: (3 + (3 × 5)) + 6
4: 3 + (3 × 5) + 6
5: 3 + (3 × 5 + 6)
6: 3 + ((3 × 5) + 6)
7: (3 + 3) × 5 - 6
8: ((3 + 3) × 5) - 6
9: (3 × 3 - 5) × 6
10: ((3 × 3) - 5) × 6
11: 3 + 5 × 3 + 6
12: (3 + 5 × 3) + 6
13: (3 + (5 × 3)) + 6
14: 3 + (5 × 3) + 6
15: 3 + (5 × 3 + 6)
16: 3 + ((5 × 3) + 6)
17: 3 × 5 + 3 + 6
18: (3 × 5) + 3 + 6
19: (3 × 5 + 3) + 6
20: ((3 × 5) + 3) + 6
21: 3 × 5 +(3 + 6)
22: (3 × 5) + (3 + 6)
23: 3 × (5 - 3 + 6)
24: 3 × ((5 - 3) + 6)
25: 3 × (5 - (3 - 6))
26: (3 + 5) × (6 - 3)
27: 3 × 5 + 6 + 3
28: (3 × 5) + 6 + 3
29: (3 × 5 + 6) + 3
30: ((3 × 5) + 6) + 3
31: 3 × 5 +(6 + 3)
32: (3 × 5) + (6 + 3)
33: 3 × (5 + 6 - 3)
34: 3 × ((5 + 6) - 3)
35: 3 × (5 + (6 - 3))
36: 3 + 6 + 3 × 5
37: (3 + 6) + 3 × 5
38: 3 + (6 + 3 × 5)
39: 3 + (6 + (3 × 5))
40: 3 + 6 +(3 × 5)
41: (3 + 6) + (3 × 5)
42: 3 × (6 - 3 + 5)
43: 3 × ((6 - 3) + 5)
44: 3 × (6 - (3 - 5))
45: 3 + 6 + 5 × 3
46: (3 + 6) + 5 × 3
47: 3 + (6 + 5 × 3)
48: 3 + (6 + (5 × 3))
49: 3 + 6 +(5 × 3)
50: (3 + 6) + (5 × 3)
51: 3 × (6 + 5 - 3)
52: 3 × ((6 + 5) - 3)
53: 3 × (6 + (5 - 3))
54: (5 - 3 ÷ 3) × 6
55: (5 - (3 ÷ 3)) × 6
56: 5 × 3 + 3 + 6
57: (5 × 3) + 3 + 6
58: (5 × 3 + 3) + 6
59: ((5 × 3) + 3) + 6
60: 5 × 3 +(3 + 6)
61: (5 × 3) + (3 + 6)
62: (5 × (3 + 3)) - 6
63: 5 × (3 + 3) - 6
64: (5 + 3) × (6 - 3)
65: (5 - 3 + 6) × 3
66: ((5 - 3) + 6) × 3
67: (5 - (3 - 6)) × 3
68: 5 × 3 + 6 + 3
69: (5 × 3) + 6 + 3
70: (5 × 3 + 6) + 3
71: ((5 × 3) + 6) + 3
72: 5 × 3 +(6 + 3)
73: (5 × 3) + (6 + 3)
74: (5 + 6 - 3) × 3
75: ((5 + 6) - 3) × 3
76: (5 + (6 - 3)) × 3
77: 5 × 6 -(3 + 3)
78: (5 × 6) - (3 + 3)
79: 5 × 6 - 3 - 3
80: (5 × 6) - 3 - 3
81: (5 × 6 - 3) - 3
82: ((5 × 6) - 3) - 3
83: 6 + 3 + 3 × 5
84: (6 + 3) + 3 × 5
85: 6 + (3 + 3 × 5)
86: 6 + (3 + (3 × 5))
87: 6 + 3 +(3 × 5)
88: (6 + 3) + (3 × 5)
89: (6 - 3) × (3 + 5)
90: 6 × (3 × 3 - 5)
91: 6 × ((3 × 3) - 5)
92: 6 + 3 + 5 × 3
93: (6 + 3) + 5 × 3
94: 6 + (3 + 5 × 3)
95: 6 + (3 + (5 × 3))
96: 6 + 3 +(5 × 3)
97: (6 + 3) + (5 × 3)
98: 6 + 3 × 5 + 3
99: (6 + 3 × 5) + 3
100: (6 + (3 × 5)) + 3
101: 6 + (3 × 5) + 3
102: 6 + (3 × 5 + 3)
103: 6 + ((3 × 5) + 3)
104: (6 - 3 + 5) × 3
105: ((6 - 3) + 5) × 3
106: (6 - (3 - 5)) × 3
107: (6 - 3) × (5 + 3)
108: (6 + 5 - 3) × 3
109: ((6 + 5) - 3) × 3
110: (6 + (5 - 3)) × 3
111: 6 + 5 × 3 + 3
112: (6 + 5 × 3) + 3
113: (6 + (5 × 3)) + 3
114: 6 + (5 × 3) + 3
115: 6 + (5 × 3 + 3)
116: 6 + ((5 × 3) + 3)
117: 6 × 5 -(3 + 3)
118: (6 × 5) - (3 + 3)
119: 6 × 5 - 3 - 3
120: (6 × 5) - 3 - 3
121: (6 × 5 - 3) - 3
122: ((6 × 5) - 3) - 3
123: 6 × (5 - 3 ÷ 3)
124: 6 × (5 - (3 ÷ 3))
#include <stdio.h> void main() int a[3][3]=1,2,3,4,5,6,i,j,s=0; for(i=1;i<3;i+
首先,你对数组的赋值结果如下:
a 0 1 2
0 1 2 0
1 3 4 0
2 5 6 0
然后,你从 i= 1 开始 第一个循环,取 a(1,0) 的值
接下来第二圈循环,取a(2,0)和 a(2,1)的值
从上表得知,结果= 3+5+6 = 14
先化简,再求值:(1+x?3x+3)÷2xx2?9,其中x=3+3
原式=(
x+3 |
x+3 |
+
x?3 |
x+3 |
)÷
2x |
x2?9 |
=
2x |
x+3 |
×
(x?3)(x+3) |
2x |
=x-3,
当x=
3 |
+3时,原式=
3 |
.
先化简再求值:2(x-2)(x+9)+(x+3)(3-x)-(x-3)2,其中x=-3
2(x-2)(x+9)+(x+3)(3-x)-(x-3)2,
=(2x-4)(x+9)-x2+9-x2+6x-9,
=2x2+14x-36-x2+9-x2+6x-9,
=20x-36,
当x=-3时,原式=20×(-3)-36,
=-96.
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