题目内容
下面各题怎样算简便就怎样算.
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(3)按照从左到右顺序计算解答,
(2)按照先算乘法,再算减法顺序计算解答,
(4)(5)运用乘法分配律解答,
(6)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算解答.
(2)按照先算乘法,再算减法顺序计算解答,
(4)(5)运用乘法分配律解答,
(6)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算解答.
解答:
解:(1)
×
×
=
×
=
;
(2)
-
×
=
-1
=
;
(3)
×
÷
=
÷
=
;
(4)
×
+
÷
=(
+
)×
=1×
=1
;
(5)
×
+
×
=(
+
)×
=
×
=
;
(6)
×[(
-
)÷
]
=
×[
÷
]
=
×
=
.
| 3 |
| 5 |
| 5 |
| 27 |
| 3 |
| 8 |
=
| 1 |
| 9 |
| 3 |
| 8 |
=
| 1 |
| 24 |
(2)
| 6 |
| 5 |
| 5 |
| 6 |
| 6 |
| 5 |
=
| 6 |
| 5 |
=
| 1 |
| 5 |
(3)
| 1 |
| 4 |
| 8 |
| 9 |
| 9 |
| 10 |
=
| 2 |
| 9 |
| 9 |
| 10 |
=
| 20 |
| 81 |
(4)
| 2 |
| 3 |
| 8 |
| 5 |
| 1 |
| 3 |
| 5 |
| 8 |
=(
| 2 |
| 3 |
| 1 |
| 3 |
| 8 |
| 5 |
=1×
| 8 |
| 5 |
=1
| 3 |
| 5 |
(5)
| 7 |
| 15 |
| 9 |
| 22 |
| 13 |
| 15 |
| 7 |
| 22 |
=(
| 9 |
| 15 |
| 13 |
| 15 |
| 7 |
| 22 |
=
| 22 |
| 15 |
| 7 |
| 22 |
=
| 7 |
| 15 |
(6)
| 3 |
| 4 |
| 7 |
| 15 |
| 1 |
| 5 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 4 |
| 15 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 10 |
点评:(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,是本题考查知识点.
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