题目内容
计算:
×(
+28)
×27+16×
(
+
)×23+
.
5 |
14 |
14 |
25 |
16 |
23 |
19 |
23 |
(
1 |
69 |
2 |
71 |
25 |
71 |
考点:分数的四则混合运算
专题:运算顺序及法则
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;
(3)根据乘法分配律和加法结合律进行简算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律和加法结合律进行简算.
解答:
解:(1)
×(
+28)
=
×
+
×28
=
+10
=10
;
(2)
×27+16×
=
×27+
×19
=
×(27+19)
=
×46
=32;
(3)(
+
)×23+
=
×23+
×23+
=
+
+
=
+(
+
)
=
+1
=1
.
5 |
14 |
14 |
25 |
=
5 |
14 |
14 |
25 |
5 |
14 |
=
1 |
5 |
=10
1 |
5 |
(2)
16 |
23 |
19 |
23 |
=
16 |
23 |
16 |
23 |
=
16 |
23 |
=
16 |
23 |
=32;
(3)(
1 |
69 |
2 |
71 |
25 |
71 |
=
1 |
69 |
2 |
71 |
25 |
71 |
=
1 |
3 |
46 |
71 |
25 |
71 |
=
1 |
3 |
46 |
71 |
25 |
71 |
=
1 |
3 |
=1
1 |
3 |
点评:考查了运算定律与简便运算,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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