知识大全 计算下面各题,能简算的要用简便方法计算. 40.2-4÷80×2.4 34×(117+113)×13 3.9-5.7+7
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计算下面各题,能简算的要用简便方法计算. 40.2-4÷80×2.4 34×(117+113)×13 3.9-5.7+7
(1)40.2-4÷80×2.4,
=40.2-0.05×2.4,
=40.2-0.12,
=40.08;
(2)34×(
1 |
17 |
+
1 |
13 |
)×13,
=(34×13)×(
1 |
17 |
+
1 |
13 |
),
=34×
1 |
17 |
×13+13×
1 |
13 |
×34,
=2×13+1×34,
=26+34,
=60;
(3)3.9-5.7+7.1-2.3,
=(3.9+7.1)-(5.7+2.3),
=11-8,
=3;
(4)
9 |
20 |
÷[
2 |
3 |
×(
4 |
5 |
-
1 |
2 |
)],
=
9 |
20 |
÷[
2 |
3 |
×
3 |
10 |
],
=
9 |
20 |
÷
1 |
5 |
,
=
9 |
4 |
.
计算下列各题.能简算的要用简便方法计算.(34-316)×(29+13) ...
(1)(
3 |
4 |
-
3 |
16 |
)×(
2 |
9 |
+
1 |
3 |
),
=
9 |
16 |
×
5 |
9 |
,
=
5 |
16 |
;
(2)125×0.25×3.2
=125×0.25×4×0.8,
=(125×0.8)×(0.25×4),
=100×1,
=100;
(3)
2 |
3 |
+(
3 |
5 |
?
1 |
4 |
)×
4 |
7 |
,
=
2 |
3 |
+
7 |
20 |
×
4 |
7 |
,
=
2 |
3 |
+
1 |
5 |
,
=
13 |
15 |
;
(4)
3 |
8 |
×
6 |
7 |
+
6 |
7 |
÷8,
=
3 |
8 |
×
6 |
7 |
+
6 |
7 |
×
1 |
8 |
,
=(
3 |
8 |
+
1 |
8 |
)×
6 |
7 |
,
=
1 |
2 |
×
6 |
7 |
,
=
3 |
7 |
;
(5)5025-2940÷28×37,
=5025-105×37,
=5025-3885,
=1140;
(6)(25+25+25)×
1 |
3 |
=25×3×
1 |
3 |
,
=25.
计算下面各题,能简算的要用简便方法计算. 23.4-5.7-4.3 (467+36×3)÷23 25×50×4×6 46×16+1
(1)23.4-5.7-4.3,
=23.4-(5.7+4.3),
=23.4-10,
=13.4;
(2)(467+36×3)÷23,
=(467+108)÷23,
=575÷23,
=25;
(3)25×50×4×6,
=(25×4)×(50×6),
=100×300,
=30000;
(4)46×16+16×54,
=(46+54)×16,
=100×16,
=1600;
(5)14.9+3.7+5.1+6.3,
=(14.9+5.1)+(3.7+6.3),
=20+10,
=30;
(6)3800÷(1280-72×15),
=3800÷(1280-1080),
=3800÷200,
=19;
(7)1800-800÷25×16,
=1800-32×16,
=1800-512,
=1288;
(8)65×102,
=65×(100+2),
=6500+130,
=6630;
(9)99×48+48,
=(99+1)×48,
=100×48,
=4800.
计算下面各题,能简算的要用简便方法计算.①250×8-245②10.15-6.25-3.75+7.85③ 7 8 ×
①250×8-245, =2000-245, =1755;②10.15-6.25-3.75+7.85, =10.15+7.85-(6.25+3.75), =18-10, =8; ③
×
+
÷8,
×
+
×
,
+
)×
,
,
; ④24+5÷(3-2.5), ⑤
×(
+1÷
),
×(
+
),
×(
+
),
×
,
; ⑥2÷[4×(
-
)]
-
)],
],
, |
计算下面各题,能简算的要用简便方法算.0.75+1.25×2.4 5.67×0.21-0.62 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
=3.8×(6.7+3.3)
=3.8×10
=38;
(4)1.28×0.29-0.29×0.28
=0.29×(1.28-0.28)
=0.29×1
=0.29;
(5)101×4.8
=(100+1)×4.8
=100×4.8+4.8
=480+4.8
=484.8;
(6)4.89×99+4.89
=4.89×(99+1)
=4.89×100
=489.
计算下面各题,能用简便方法计算的,要用简便方法计算.2.5×80×12.5×4648÷[35×(35-37)]521÷[(37
(1)2.5×80×12.5×4
=(2.5×4)×(12.5×80)
=10×1000
=10000;
(2)648÷[35×(
3 |
5 |
-
3 |
7 |
)]
=648÷[35×
3 |
5 |
-35×
3 |
7 |
]
=648÷(21-15)
=648÷6
=108;
(3)
5 |
21 |
÷[(
3 |
7 |
-
1 |
14 |
)×
5 |
6 |
]
=
5 |
21 |
÷[
5 |
14 |
×
5 |
6 |
]
=
5 |
21 |
÷
25 |
84 |
=
4 |
5 |
.
计算下面各题.(能简算的要用简便演算法)45.4×10.1 &...
(1)45.4×10.1
=45.4×(10+0.1)
=45.4×10+45.4×0.1
=454+4.54
=458.54;
(2)840÷0.5÷8
=840÷(0.5×8)
=840÷4
=210;
(3)6.24-0.24×18
=6.24-4.32
=1.92;
(4)0.125×3.2×25
=0.125×(8×0.4)×25
=(0.125×8)×(0.4×25)
=1×10
=10.
计算下面各题(能简便计算的要用简便方法计算) 456-199 0.25×5.7×4 252÷24-0.4×6 (3.8-1.8÷2
(1)456-199,
=456-200+1,
=256+1,
=257;
(2)0.25×5.7×4,
=0.25×4×5.7,
=1×5.7,
=5.7;
(3)252÷24-0.4×6,
=10.5-2.4,
=8.1;
(4)(3.8-1.8÷2)×
1 |
2 |
,
=(3.8-0.9)×
1 |
2 |
,
=2.9×
1 |
2 |
,
=1.45;
(5)(8+
4 |
9 |
)÷4,
=(8+
4 |
9 |
)×
1 |
4 |
,
=8×
1 |
4 |
+
4 |
9 |
×
1 |
4 |
,
=2+
1 |
9 |
,
=2
1 |
9 |
;
(6)4.4-
1 |
5 |
+1.6-
4 |
5 |
,
=(4.4+1.6)-(
1 |
5 |
+
4 |
5 |
),
=6-1,
=5.
下面各题,能简算的要用简便方法计算.3.9+0.56+6.1+0.4450÷2.5+1.8×4.56.87×
(1)3.9+0.56+6.1+0.44, =(3.9+6.1)+(0.56+0.44), =10+1, =11;(2)50÷2.5+1.8×4.5, =20+8.1, =28.1; (3)6.87×[40÷(3.49-3.09)], (4)0.8×(12.5+0.125), |
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