题目内容
计算题.
×(
+
)
÷(3-
-
)
÷[
-(
+
)].
| 1 |
| 15 |
| 1 |
| 3 |
| 1 |
| 12 |
| 1 |
| 4 |
| 7 |
| 15 |
| 8 |
| 15 |
| 4 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
分析:(1)先算括号里的加法,再算括号外面的乘法.
(2)先根据减法的性质,算括号里面的,再算除以.
(3)先算小括号里面的,再算中括号里面的,最后算括号外面的除法.
(2)先根据减法的性质,算括号里面的,再算除以.
(3)先算小括号里面的,再算中括号里面的,最后算括号外面的除法.
解答:解:(1)
×(
+
)
=
×
,
=
,
(2)
÷(3-
-
)
=
÷[3-(
+
)],
=
÷[3-1],
=
÷2,
=
.
(3)
÷[
-(
+
)],
=
÷[
-
],
=
×3,
=
.
| 1 |
| 15 |
| 1 |
| 3 |
| 1 |
| 12 |
=
| 1 |
| 15 |
| 5 |
| 12 |
=
| 1 |
| 36 |
(2)
| 1 |
| 4 |
| 7 |
| 15 |
| 8 |
| 15 |
=
| 1 |
| 4 |
| 7 |
| 15 |
| 8 |
| 15 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 8 |
(3)
| 4 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 4 |
| 9 |
| 5 |
| 6 |
| 3 |
| 6 |
=
| 4 |
| 9 |
=
| 4 |
| 3 |
点评:本题主要考查了学生分数四则运算的计算能力.要细心认真才能做全对.
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