题目内容
脱式计算,能简算的要简算并写出主要过程.
×0.375÷
×
+
×
(0.75-
)÷(
+
)
| 2 |
| 9 |
| 6 |
| 7 |
| 8 |
| 9 |
| 10 |
| 11 |
| 10 |
| 11 |
| 1 |
| 9 |
(0.75-
| 5 |
| 16 |
| 3 |
| 8 |
| 1 |
| 2 |
分析:(1)把0.375化为分数
,把除法改为乘法,约分计算;
(2)运用乘法分配律的逆运算简算;
(3)把0.75化为分数
,先算两个括号内的,最后算除法.
| 3 |
| 8 |
(2)运用乘法分配律的逆运算简算;
(3)把0.75化为分数
| 3 |
| 4 |
解答:解:(1)
×0.375÷
,
=
×
×
,
=
;
(2)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)(0.75-
)÷(
+
),
=(
-
)÷
,
=
×
,
=
.
| 2 |
| 9 |
| 6 |
| 7 |
=
| 2 |
| 9 |
| 3 |
| 8 |
| 7 |
| 6 |
=
| 7 |
| 72 |
(2)
| 8 |
| 9 |
| 10 |
| 11 |
| 10 |
| 11 |
| 1 |
| 9 |
=(
| 8 |
| 9 |
| 1 |
| 9 |
| 10 |
| 11 |
=1×
| 10 |
| 11 |
=
| 10 |
| 11 |
(3)(0.75-
| 5 |
| 16 |
| 3 |
| 8 |
| 1 |
| 2 |
=(
| 3 |
| 4 |
| 5 |
| 16 |
| 7 |
| 8 |
=
| 7 |
| 16 |
| 8 |
| 7 |
=
| 1 |
| 2 |
点评:此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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