题目内容
用你喜欢的方法计算.
×
+
×
×12+
×19+
.
7 |
13 |
14 |
9 |
7 |
9 |
12 |
13 |
5 |
8 |
5 |
8 |
5 |
8 |
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算.
解答:解:(1)
×
+
×
,
=
×
+
×
,
=
×(
+
),
=
×
,
=
;
(2)
×12+
×19+
,
=
×(12+19+1),
=
×32,
=20.
7 |
13 |
14 |
9 |
7 |
9 |
12 |
13 |
=
7 |
13 |
14 |
9 |
12 |
9 |
7 |
13 |
=
7 |
13 |
14 |
9 |
12 |
9 |
=
7 |
13 |
26 |
9 |
=
14 |
9 |
(2)
5 |
8 |
5 |
8 |
5 |
8 |
=
5 |
8 |
=
5 |
8 |
=20.
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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