题目内容
怎样算简便就怎样算.
75%÷6×
;
-(
-50%);
×
+62.5%÷
; (
-
)×5×7.
75%÷6×
| 8 |
| 9 |
| 11 |
| 6 |
| 5 |
| 6 |
| 3 |
| 8 |
| 5 |
| 11 |
| 11 |
| 5 |
| 6 |
| 5 |
| 6 |
| 7 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)从左向右依次计算即可;
(2)根据减法的性质简算即可;
(3)(4)根据乘法分配律简算即可.
(2)根据减法的性质简算即可;
(3)(4)根据乘法分配律简算即可.
解答:
解:(1)75%÷6×
=
×
×
=
×
=
(2)
-(
-50%)
=
-
+0.5
=1+0.5
=1.5
(3)
×
+62.5%÷
=(
+62.5%)×
=(0.375+0.625)×
=1×
=
(4)(
-
)×5×7
=
×5×7-
×7×5
=42-30
=12
| 8 |
| 9 |
=
| 3 |
| 4 |
| 1 |
| 6 |
| 8 |
| 9 |
=
| 1 |
| 8 |
| 8 |
| 9 |
=
| 1 |
| 9 |
(2)
| 11 |
| 6 |
| 5 |
| 6 |
=
| 11 |
| 6 |
| 5 |
| 6 |
=1+0.5
=1.5
(3)
| 3 |
| 8 |
| 5 |
| 11 |
| 11 |
| 5 |
=(
| 3 |
| 8 |
| 5 |
| 11 |
=(0.375+0.625)×
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(4)(
| 6 |
| 5 |
| 6 |
| 7 |
=
| 6 |
| 5 |
| 6 |
| 7 |
=42-30
=12
点评:此题主要考查了整数、分数、百分数四则混合运算,注意运算顺序,注意乘法运算定律、减法的性质的应用.
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