知识大全 计算下面各题,能简算的用简便方法计算2272-6360÷24[6.85-(0.65+0.7)]÷2.5(910-45×58)÷512 &n
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计算下面各题,能简算的用简便方法计算2272-6360÷24[6.85-(0.65+0.7)]÷2.5(910-45×58)÷512 &n
(1)2272-6360÷24
=2272-265,
=2007;
(2)[6.85-(0.65+0.7)]÷2.5
=[6.85-1.35]÷2.5,
=5.5÷2.5,
=2.2;
(3)(
9 |
10 |
-
4 |
5 |
×
5 |
8 |
)÷
5 |
12 |
=(
9 |
10 |
-
1 |
2 |
)×
12 |
5 |
,
=
2 |
5 |
×
12 |
5 |
,
=
24 |
25 |
;
(4)(
5 |
8 |
+
1 |
27 |
)×8+
19 |
27 |
=
5 |
8 |
×8+
1 |
27 |
×8+
19 |
27 |
,
=8+(
8 |
27 |
+
19 |
27 |
),
=8+1,
=9.
脱式计算,能简算的要简算. 46×8-120÷15 [6.85-(0.65+0.7)]÷2.5 712÷9+
(1)46×8-120÷15,
=368-8,
=360;
(2)[6.85-(0.65+0.7)]÷2.5,
=[6.85-0.65-0.7]÷2.5,
=[6.2-0.7]÷2.5,
=5.5÷2.5,
=2.2;
(3)
7 |
12 |
÷9+
1 |
9 |
×
5 |
12 |
,
=
7 |
12 |
×
1 |
9 |
+
1 |
9 |
×
5 |
12 |
,
=(
7 |
12 |
+
5 |
12 |
)×
1 |
9 |
,
=1×
1 |
9 |
,
=
1 |
9 |
;
(4)5.58-
3 |
5 |
+5.42-
2 |
5 |
,
=(5.58+5.42)-(
3 |
5 |
+
2 |
5 |
),
=11-1,
=10.
计算下面各题.(能简算的要用简便方法计算.) 32×38÷6779×58+79×3815÷(512+56)56×37×25
(1)32×
3 |
8 |
÷
6 |
7 |
=12÷
6 |
7 |
=14;
(2)
7 |
9 |
×
5 |
8 |
+
7 |
9 |
×
3 |
8 |
=
7 |
9 |
×(
5 |
8 |
+
3 |
8 |
)
=
7 |
9 |
×1
=
7 |
9 |
;
(3)15÷(
5 |
12 |
+
5 |
6 |
)
=15÷
5 |
4 |
=12;
(4)
5 |
6 |
×
3 |
7 |
×
2 |
5 |
=
5 |
14 |
×
2 |
5 |
=
1 |
7 |
.
计算下面各题,能简算的用简便方法计算。 18.9×9.9 12.5×8.94×0.8 7.4×0.5+7
|
计算下面各题,能简算的要用简便方法计算.2400÷75+48×1.5 &...
(1)2400÷75+48×1.5
=32+72
=104
(2)
7 |
8 |
÷
1 |
2 |
+(
4 |
5 |
-
1 |
5 |
)
=1.75+0.6
=2.35
(3)2.75×5.8+3.2×275%+2.75
=2.75×(5.8+3.2+1)
=2.75×10
=27.5
(4)
5 |
16 |
×12.5÷
5 |
4 |
×8
=(
5 |
16 |
÷
5 |
4 |
)×(8×12.5)
=
1 |
4 |
×100
=25.
计算下面各题,能简算的用简便方法计算. 820-20×24÷80= [135-(35+75)]×48= 8×3×125= 55
(1)820-20×24÷80, =820-480÷80, =820-6, =814;(2)[135-(35+75)]×48, =[135-35-75]×48, =(100-75)×48, =25×4×12, =100×12, =1200; (3)8×3×125, (4)55×45-45×45, (5)24×19+24, |
计算下面各题,能简算的要用简便方法计算.①250×8-245 ...
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
7 |
8 |
×
5 |
9 |
+
5 |
9 |
÷8,
=
7 |
8 |
×
5 |
9 |
+
5 |
9 |
×
1 |
8 |
,
=(
1 |
8 |
+
7 |
8 |
)×
5 |
9 |
,
=1×
5 |
9 |
,
=
5 |
9 |
;
④24+5÷(3-2.5),
=24+5÷0.5,
=24+10,
=34;
⑤
10 |
13 |
×(
3 |
4 |
+1÷
5 |
6 |
),
=
10 |
13 |
×(
3 |
4 |
+
6 |
5 |
),
=
10 |
13 |
×(
15 |
20 |
+
24 |
20 |
),
=
10 |
13 |
×
39 |
20 |
,
=
3 |
2 |
;
⑥2÷[4×(
1 |
2 |
-
1 |
3 |
)]
=2÷[4×(
3 |
6 |
-
2 |
6 |
)],
=2÷[4×
1 |
6 |
],
=2÷
计算下面各题,能简算的要用简便方法计算.96÷0.24÷4 2.56×99&nb...
(1)96÷0.24÷4
=96÷(0.24×4)
=96÷0.96
=100;
(2)2.56×99
=2.56×(100-1)
=2.56×100-2.56×1
=256-2.56
=253.44;
(3)19.98÷5.4-2.08
=3.7-2.08
=1.62;
(4)7.8×99+7.8
=7.8×(99+1)
=7.8×100
=780;
(5)14.56÷0.26×7.01
=56×7.01
=392.56;
(6)5.78+0.25×1.6
=5.78+0.4
=6.18.
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