题目内容
能简便的用简便方法计算.
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考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照从左到右顺序计算解答,
(2)按照先算除法,再算减法顺序计算解答,
(3)(4)(5)(6)运用乘法分配律解答.
(2)按照先算除法,再算减法顺序计算解答,
(3)(4)(5)(6)运用乘法分配律解答.
解答:
解:(1)
÷
×
=
×
=1
;
(2)1-
÷
=1-
=
;
(3)(
+
+
)×24
=
×24+
×24+
×24
=12+16+18
=46;
(4)
×7+
×11
=
×(7+11)
=
×18
=10;
(5)
×99+
=
×(99+1)
=
×100
=16;
(6)(
+
)÷
=
×
+
×
=1
+1
=2
.
| 10 |
| 13 |
| 35 |
| 26 |
| 7 |
| 3 |
=
| 4 |
| 7 |
| 7 |
| 3 |
=1
| 1 |
| 3 |
(2)1-
| 7 |
| 9 |
| 7 |
| 8 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
(3)(
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
=12+16+18
=46;
(4)
| 5 |
| 9 |
| 5 |
| 9 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
=10;
(5)
| 4 |
| 25 |
| 4 |
| 25 |
=
| 4 |
| 25 |
=
| 4 |
| 25 |
=16;
(6)(
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
=
| 7 |
| 8 |
| 16 |
| 13 |
| 13 |
| 16 |
| 16 |
| 13 |
=1
| 1 |
| 13 |
=2
| 1 |
| 13 |
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题.
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