题目内容
计算
(
-
)÷
0.6+
×11-2×60%
12.67-
-
[1-(
-
)]×
.
(
| 5 |
| 6 |
| 2 |
| 9 |
| 1 |
| 18 |
0.6+
| 3 |
| 5 |
12.67-
| 3 |
| 8 |
| 5 |
| 8 |
[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:①(
-
)÷
先算括号内的,再根据除去一个数等于乘以它的倒数,计算即可;
②0.6+
×11-2×60%根据乘法的分配律计算;
③12.67-
-
,根据一个数连续减去两个数等于这个数减去这两个数的和;
④[1-(
-
)]×
.根据运算法则,先算小括号,再算中括号,最后算乘法.
| 5 |
| 6 |
| 2 |
| 9 |
| 1 |
| 18 |
②0.6+
| 3 |
| 5 |
③12.67-
| 3 |
| 8 |
| 5 |
| 8 |
④[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
解答:
解:①(
-
)÷
=
÷
=
×18
=11
②0.6+
×11-2×60%
=0.6+0.6×11-2×0.6
=0.6×(1+11-2)
=0.6×10
=6
③12.67-
-
=12.67-(
+
)
=12.67-1
=11.67
④[1-(
-
)]×
=[1-
]×
=
×
=
| 5 |
| 6 |
| 2 |
| 9 |
| 1 |
| 18 |
=
| 11 |
| 18 |
| 1 |
| 18 |
=
| 11 |
| 18 |
=11
②0.6+
| 3 |
| 5 |
=0.6+0.6×11-2×0.6
=0.6×(1+11-2)
=0.6×10
=6
③12.67-
| 3 |
| 8 |
| 5 |
| 8 |
=12.67-(
| 3 |
| 8 |
| 5 |
| 8 |
=12.67-1
=11.67
④[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
=[1-
| 1 |
| 4 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
点评:掌握整数、小数和分数的计算法则是解题的关键.
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