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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