
下面各题怎样简便就怎样计算.3.6-2.8+7.4-7.2 ...
下面各题怎样简便就怎样计算.3.6-2.8+7.4-7.235×(1-47)÷5124.85×0.17+0.485×8.3310÷(52-53)×56....
下面各题怎样简便就怎样计算.3.6-2.8+7.4-7.2 35×(1-47)÷5124.85×0.17+0.485×8.3 310÷(52-53)×56.
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(1)3.6-2.8+7.4-7.2
=(3.6-2.8)+(7.4-7.2)
=1+0.2
=1.2
(2)35×(1-
)÷
=35×
×
=36
(3)4.85×0.17+0.485×8.3
=0.485×1.7+0.485×8.3
=0.485×(1.7+8.3)
=0.485×10
=4.85
(4)
÷(
-
)×
=
÷
×
=
×(
×
)
=
×1
=
=(3.6-2.8)+(7.4-7.2)
=1+0.2
=1.2
(2)35×(1-
4 |
7 |
5 |
12 |
=35×
3 |
7 |
12 |
5 |
=36
(3)4.85×0.17+0.485×8.3
=0.485×1.7+0.485×8.3
=0.485×(1.7+8.3)
=0.485×10
=4.85
(4)
3 |
10 |
5 |
2 |
5 |
3 |
5 |
6 |
=
3 |
10 |
5 |
6 |
5 |
6 |
=
3 |
10 |
6 |
5 |
5 |
6 |
=
3 |
10 |
=
3 |
10 |
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