题目内容
怎样简便就怎样算
101×
×
-
÷
÷[(
+
)×2].
101×
| 7 |
| 100 |
| 7 |
| 2 |
| 5 |
| 8 |
| 3 |
| 2 |
| 8 |
| 5 |
| 4 |
| 5 |
| 3 |
| 5 |
| 1 |
| 2 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)利用乘法分配律简算;
(3)先算加法,再算乘法,最后算除法.
(3)先算加法,再算乘法,最后算除法.
解答:
解:(1)101×
=100×
+1×
=7+
=7
;
(2)2×
-
÷
=2×
-
×
=(2-
)×
=
×
=
;
(3)
÷[(
+
)×2]
=
÷[
×2]
=
×
=
.
| 7 |
| 100 |
=100×
| 7 |
| 100 |
| 7 |
| 100 |
=7+
| 7 |
| 100 |
=7
| 7 |
| 100 |
(2)2×
| 5 |
| 8 |
| 3 |
| 2 |
| 8 |
| 5 |
=2×
| 5 |
| 8 |
| 3 |
| 2 |
| 5 |
| 8 |
=(2-
| 3 |
| 2 |
| 5 |
| 8 |
=
| 1 |
| 2 |
| 5 |
| 8 |
=
| 5 |
| 16 |
(3)
| 4 |
| 5 |
| 3 |
| 5 |
| 1 |
| 2 |
=
| 4 |
| 5 |
| 11 |
| 10 |
=
| 4 |
| 5 |
| 5 |
| 11 |
=
| 4 |
| 11 |
点评:分数混合运算的关键是抓住运算顺序,正确利用运算定律简算.
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