题目内容
计算:
×[(10-
)÷
]÷
(
+
)×17×14.
| 5 |
| 16 |
| 7 |
| 2 |
| 13 |
| 2 |
| 8 |
| 5 |
(
| 1 |
| 51 |
| 1 |
| 42 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算小括号里面的减法,再算中括号里面的除法,然后算括号外的乘法,最后算括号外的除法;
(2)综合运用乘法结合律和乘法分配律简算.
(2)综合运用乘法结合律和乘法分配律简算.
解答:
解:(1)
×[(10-
)÷
]÷
=
×[
÷
]÷
=
×1÷
=
×
=
;
(2)(
+
)×17×14
=
×17×14+
×14×17
=
+
=
.
| 5 |
| 16 |
| 7 |
| 2 |
| 13 |
| 2 |
| 8 |
| 5 |
=
| 5 |
| 16 |
| 13 |
| 2 |
| 13 |
| 2 |
| 8 |
| 5 |
=
| 5 |
| 16 |
| 8 |
| 5 |
=
| 5 |
| 16 |
| 5 |
| 8 |
=
| 25 |
| 128 |
(2)(
| 1 |
| 51 |
| 1 |
| 42 |
=
| 1 |
| 51 |
| 1 |
| 42 |
=
| 14 |
| 3 |
| 17 |
| 3 |
=
| 31 |
| 3 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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