题目内容
(1)(
+
-
)×12
(2)2-
÷
-
(3)99×
.
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
(2)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
(3)99×
| 99 |
| 100 |
分析:(1)根据乘法分配律进行简算;
(2)先算除法,再根据减法的性质进行简算;
(3)根据乘法分配律进行简算.
(2)先算除法,再根据减法的性质进行简算;
(3)根据乘法分配律进行简算.
解答:解:
(1)(
+
-
)×12,
=
×12+
×12-
×12,
=2+9-8,
=11-8,
=3;
(2)2-
÷
-
,
=2-
-
,
=2-(
+
),
=2-2,
=0;
(3)99×
,
=(100-1)×
,
=100×
-1×
,
=99-
,
=98
.
(1)(
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
=2+9-8,
=11-8,
=3;
(2)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2,
=0;
(3)99×
| 99 |
| 100 |
=(100-1)×
| 99 |
| 100 |
=100×
| 99 |
| 100 |
| 99 |
| 100 |
=99-
| 99 |
| 100 |
=98
| 1 |
| 100 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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