题目内容
能简算要简算.
|
(
|
|
分析:(1)先算加法,再算乘法,最后算除法;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算.
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算.
解答:解:
(1)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
;
(2)(
-
+
)×12,
=
×12-
×12+
×12,
=4-2+3,
=2+3,
=5;
(3)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=2×
,
=
.
(1)
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 3 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 1 |
| 2 |
| 22 |
| 15 |
=
| 9 |
| 20 |
| 11 |
| 15 |
=
| 27 |
| 44 |
(2)(
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
=4-2+3,
=2+3,
=5;
(3)
| 7 |
| 4 |
| 5 |
| 8 |
| 1 |
| 4 |
| 8 |
| 5 |
=
| 7 |
| 4 |
| 5 |
| 8 |
| 1 |
| 4 |
| 5 |
| 8 |
=(
| 7 |
| 4 |
| 1 |
| 4 |
| 5 |
| 8 |
=2×
| 5 |
| 8 |
=
| 5 |
| 4 |
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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