题目内容
(2013?中山模拟)脱式计算
÷[
-(
+
)];
÷23+
×
+
.
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 8 |
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
分析:(1)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法;
(2)先把除法变成乘法,再运用乘法分配律简算.
(2)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)
÷[
-(
+
)],
=
÷[
-
],
=
÷
,
=
;
(2)
÷23+
×
+
,
=
×
+
×
+
,
=(
+
+1)×
,
=2×
,
=
.
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 8 |
=
| 2 |
| 5 |
| 3 |
| 4 |
| 11 |
| 24 |
=
| 2 |
| 5 |
| 7 |
| 24 |
=
| 48 |
| 35 |
(2)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=2×
| 1 |
| 23 |
=
| 2 |
| 23 |
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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