题目内容
计算,能简算的要简算
(
+
+
)÷
[
-(
-0.25)]×
×[(
-
)×4]
×9+
.
(
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 12 |
[
| 3 |
| 4 |
| 7 |
| 16 |
| 17 |
| 9 |
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
| 3 |
| 5 |
| 3 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(4)运用乘法分配律解答,
(2)先运用减法性质,即可解答,
(3)先运用乘法分配律,再按照先算括号里面的,最后算括号外面的顺序计算即可解答.
(2)先运用减法性质,即可解答,
(3)先运用乘法分配律,再按照先算括号里面的,最后算括号外面的顺序计算即可解答.
解答:
解:(1)(
+
+
)÷
=
÷
+
÷
+
÷
=9+8+2
=19;
(2)[
-(
-0.25)]×
=[
+0.25-
]×
=[1-
]×
=
×
=1
;
(3)
×[(
-
)×4]
=
×[
×4-
×4]
=
×[3-2]
=
×1
=
;
(4)
×9+
=(1+9)×
=10×
=6.
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 12 |
=
| 3 |
| 4 |
| 1 |
| 12 |
| 2 |
| 3 |
| 1 |
| 12 |
| 1 |
| 6 |
| 1 |
| 12 |
=9+8+2
=19;
(2)[
| 3 |
| 4 |
| 7 |
| 16 |
| 17 |
| 9 |
=[
| 3 |
| 4 |
| 7 |
| 16 |
| 17 |
| 9 |
=[1-
| 7 |
| 16 |
| 17 |
| 9 |
=
| 9 |
| 16 |
| 17 |
| 9 |
=1
| 1 |
| 16 |
(3)
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 5 |
| 8 |
=
| 5 |
| 8 |
=
| 5 |
| 8 |
(4)
| 3 |
| 5 |
| 3 |
| 5 |
=(1+9)×
| 3 |
| 5 |
=10×
| 3 |
| 5 |
=6.
点评:本题主要考查学生运用简便方法解决问题的能力.
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