题目内容
(2012?团风县模拟)(1)(
-
)×
(2)
×[(
+
)÷
].
| 7 |
| 12 |
| 1 |
| 3 |
| 2 |
| 7 |
| 5 |
| 11 |
| 2 |
| 5 |
| 1 |
| 3 |
| 5 |
| 6 |
分析:(1)先算小括号里的减法,再算乘法即可.
(2)先算小括号里的再算中括号里的除法,最后算乘法即可.
(2)先算小括号里的再算中括号里的除法,最后算乘法即可.
解答:解:(1)(
-
)×
,
=
×
,
=
;
(2)
×[(
+
)÷
],
=
×(
÷
),
=
×
,
=
.
| 7 |
| 12 |
| 1 |
| 3 |
| 2 |
| 7 |
=
| 1 |
| 4 |
| 2 |
| 7 |
=
| 1 |
| 14 |
(2)
| 5 |
| 11 |
| 2 |
| 5 |
| 1 |
| 3 |
| 5 |
| 6 |
=
| 5 |
| 11 |
| 11 |
| 15 |
| 5 |
| 6 |
=
| 5 |
| 11 |
| 22 |
| 25 |
=
| 2 |
| 5 |
点评:递等式计算的题目要根据运算顺序计算.先算乘除再算加减,有括号的要先算括号里的.
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