题目内容
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
(0.75-
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
分析:(1)括号内运用减法的性质简算,最后算括号外的除法;
(2)把小数化为分数,两个括号同时计算,然后算乘法.
(2)把小数化为分数,两个括号同时计算,然后算乘法.
解答:解:(1)
÷(3-
-
)
=
÷[3-(
+
)]
=
÷[3-1]
=
÷2
=
;
(2)(0.75-
)×(
+
)
=(
-
)×(
+
)
=
×
=
.
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 8 |
(2)(0.75-
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
点评:注意运算顺序以及运用运算性质进行简算.
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