知识大全 计算下面各题,能简算的要用简便方法计算.(1)0.75×99+0.75 (2)56-(23-16) (3)(8.5-4)×(0
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计算下面各题,能简算的要用简便方法计算.(1)0.75×99+0.75 (2)56-(23-16) (3)(8.5-4)×(0
(1)0.75×99+0.75
=0.75×(99+1),
=75;
(2)
5 |
6 |
-(
2 |
3 |
-
1 |
6 |
)
=
5 |
6 |
+
1 |
6 |
-
2 |
3 |
,
=
1 |
3 |
;
(3)(8.5-4)×(0.32÷1.6)
=4.5×0.2,
=0.9;
(4)
5 |
6 |
×[1÷(
7 |
8 |
?
3 |
4 |
)]
=
5 |
6 |
×[1÷
1 |
8 |
],
=
5 |
6 |
×8,
=
20 |
3 |
;
(5)0.925×17+9.25×8.3
=9.25×1.7+9.25×8.3,
=9.25×(1.7+8.3),
=9.25×10,
=92.5;
(6)
7 |
15 |
×
8 |
9 |
+
8 |
15 |
×
2 |
9 |
=
8 |
15 |
×
7 |
9 |
+
8 |
15 |
×
2 |
9 |
,
=
8 |
15 |
×(
7 |
9 |
+
2 |
9 |
),
=
8 |
15 |
.
计算下面各题,能简算的要简算2.4×(3-2.5)÷0.75 4.2-1.38+5.8-3.62 0.75×99- 3 4 +2
(1)2.4×(3-2.5)÷0.75, =2.4×0.5÷0.75, =1.2÷0.75, =1.6;(2)4.2-1.38+5.8-3.62, =(4.2+5.8)-(1.38+3.62), =10-5, =5; (3)0.75×99-
+2×75%, (4)0.125×0.25×32, |
计算下面各题,能简算的要用简便方法算.0.75+1.25×2.45.67×0.21-0.623.8×6.7+3.3
(1)0.75+1.25×2.4 =0.75+(1.25×8)×0.3 =0.75+10×0.3 =0.75+3 =3.75;(2)5.67×0.21-0.62 =1.1907-0.62 =0.5707; (3)3.8×6.7+3.3×3.8 (4)1.28×0.29-0.29×0.28 (5)101×4.8 (6)4.89×99+4.89 |
计算下面各题,能简算的要用简便方法计算.(1)50-0.45-9.55(2)1.25×0.25×0.8×4(3)417×35+1317
(1)50-0.45-9.55
=50-(0.45+9.55)
=50-10
=40;
(2)1.25×0.25×0.8×4
=(1.25×0.8)×(0.25×4)
=1×1
=1;
(3)
4 |
17 |
×
3 |
5 |
+
13 |
17 |
÷
5 |
3 |
=
4 |
17 |
×
3 |
5 |
+
13 |
17 |
×
3 |
5 |
=(
4 |
17 |
+
13 |
17 |
)×
3 |
5 |
=1×
3 |
5 |
=
3 |
5 |
;
(4)1650-480÷16×15
=1650-30×15
=1650-450
=1200;
(5)(8.42-7.5)÷0.23×2.7
=0.92÷0.23×2.7
=4×2.7
=10.8;
(6)(
2 |
3 |
+
7 |
9 |
×
9 |
28 |
)÷
11 |
12 |
=(
2 |
3 |
+
1 |
4 |
)÷
11 |
12 |
=
11 |
12 |
÷
11 |
12 |
=1.
计算下面各题,能简算的要用简便方法算.①627+9105÷15②5.78×99+5.78③413×(38+0.25×23)④78.5÷0
①627+9105÷15,
=627+607,
=1234;
②5.78×99+5.78
=5.78×(99+1),
=5.78×100,
=578;
(3)
4 |
13 |
×(
3 |
8 |
+0.25×
2 |
3 |
),
=
4 |
13 |
×(
3 |
8 |
+
1 |
6 |
),
=
4 |
13 |
×
13 |
24 |
,
=
1 |
6 |
;
④78.5÷0.25÷4,
=7.85÷(0.25×4),
=7.85÷1,
=7.85;
⑤50
5 |
6 |
-45.75-4.25
=50
5 |
6 |
-(45.75+4.25),
=50
5 |
6 |
-50,
=
5 |
6 |
;
⑥7.86+0.625×1.8÷4.5,
=7.86+0.25,
=8.11.
计算下面各题,能用简便方法计算要用简便方法计算. (38+56)÷124 &nb...
(1)(
3 |
8 |
+
5 |
6 |
)÷
1 |
24 |
=
3 |
8 |
×24+
5 |
6 |
×24
=9+20
=29;
(2)205×36-2940÷28
=7380-105
=7275;
(3)(2808÷26-10.8)×2.5
=(108-10.8)×2.5
=97.2×2.5
=243;
(4)7.8÷[32×(1-
5 |
8 |
)+3.6]
=7.8÷[32×
3 |
8 |
+3.6]
=7.8÷[12+3.6]
=7.8÷15.6
=0.5;
(5)[11÷(
1 |
4 |
+
2 |
3 |
)]×
11 |
8 |
=[11÷
11 |
12 |
]×
11 |
8 |
=12×
11 |
8 |
=
33 |
2 |
;
(6)
2000 |
2001 |
×2002
=
2000 |
2001 |
×(2001+1)
=
2000 |
2001 |
×2001+
2000 |
2001 |
×1
=2000+
2000 |
2001 |
=2000
2000 |
2001 |
.
计算下面各题,能简便计算的要用简便方法计算: 2.4吨=______千克 0.75平方米=______平方分米 3
根据题意可得:
(1)2.4×1000=2400;
所以,2.4吨=2400千克;
(2)0.75×100=75;
所以,0.75平方米=75平方分米;
(3)3.82=3+0.8+0.02;
0.8×10=8;
0.02×100=2;
所以,3.82元=3元8角2分;
(4)5×100=500;
500+20=520;
所以,5m20cm=520cm.
故答案为:2400,75,3,8,2,520.
计算下面各题,能用简便方法计算的要用简便方法计算. 89×[37÷(23+17)] (873×477-198)÷
(1)
8 |
9 |
×[
3 |
7 |
÷(
2 |
3 |
+
1 |
7 |
)],
=
8 |
9 |
×[
3 |
7 |
÷
17 |
21 |
],
=
8 |
9 |
×
9 |
17 |
,
=
8 |
17 |
;
(2)(873×477-198)÷(476×874+199),
=[873×(476+1)-198]÷[476×(873+1)+199],
=[873×476+873-198]÷[476×873+476+199],
=[873×476+675]÷[476×873+675],
=1;
(3)199.9×19.98-199.8×19.97,
=199.9×19.98-19.98×199.7,
=(199.9-199.7)×19.98,
=0.2×19.98,
=3.996;
(4)
4 |
5 |
×
12 |
13 |
+16×
1 |
5 |
+
1 |
5 |
×
4 |
13 |
,
=
1 |
5 |
×
48 |
13 |
+16×
1 |
5 |
+
1 |
5 |
×
4 |
13 |
,
=(
48 |
13 |
+
4 |
13 |
+16)×
1 |
5 |
,
=(4+16)×
1 |
5 |
,
=20×
1 |
5 |
,
=4.
计算下面各题,能用简便方法计算要用简便方法计算. (1)13.92-(1.19+9.92)-2.81 (2)(25+16-21
解答:11解:(1)13.92-(1.19+9.92)-2.81,
=13.92-1.19-9.92-2.81,
=(13.92-9.92)-(1.19+2.81),
=4-4,
=0;
(2)(
2 |
5 |
+
1 |
6 |
-
2 |
15 |
)×30,
=
2 |
5 |
×30+
1 |
6 |
×30-
2 |
15 |
×30,
=12+5-4,
=13;
(3)55×66÷(11×11),
=55×66÷11÷11,
=(55÷11)×(66÷11),
=5×6,
=30;
(4)40.2-4÷80×2.4,
=40.2-0.05×2.4,
=40.2-0.12,
=40.08;
(5)
1 |
8 |
×[
1 |
2 |
÷(
3 |
5 |
×
10 |
9 |
)],
=
1 |
8 |
×[
1 |
2 |
÷
2 |
3 |
],
=
1 |
8 |
×
3 |
4 |
,
=
3 |
32 |
;
(6)
2000 |
2001 |
×2002,
=
2000 |
2001 |
×(2001+1),
=
2000 |
2001 |
×2001+
2000 |
2001 |
×1,
=2000+
2000 |
2001 |
,
=2000
2000 |
2001 |
.
计算下面各题,能简便计算的要简便计算.10.15-6.25-3.75 1.75-(0.75+ 2 5 ) 9× 11
(1)10.15-6.25-3.75, =10.15-(6.25+3.75), =10.15-10, =0.15; (2)1.75-(0.75+
=1.75-0.75-0.4, =1-0.4, =0.6; (3)9×
+
× 3,
,
,
;
+
÷
+
,
+
)+
×
,
,
;
÷(2.5×
),
÷ (
×
),
÷ 2,
×
,
; |
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