题目内容
(2013?云安县模拟)怎样简便就怎样算.
|
(1-
|
(
|
|
分析:(1)根据乘法分配律进行计算;
(2)先算除法,再算减法,最后算乘法;
(3)根据乘法分配律进行计算;
(4)先算加法,再算乘法,最后算除法.
(2)先算除法,再算减法,最后算乘法;
(3)根据乘法分配律进行计算;
(4)先算加法,再算乘法,最后算除法.
解答:解:(1)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)(1-
÷
)×
,
=(1-
)×
,
=
×
,
=
;
(3)(
+
-
)×12,
=
×12+
×12-
×12,
=2+9-8,
=3;
(4)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
.
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(2)(1-
| 1 |
| 3 |
| 4 |
| 7 |
| 3 |
| 10 |
=(1-
| 7 |
| 12 |
| 3 |
| 10 |
=
| 5 |
| 12 |
| 3 |
| 10 |
=
| 1 |
| 8 |
(3)(
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
=2+9-8,
=3;
(4)
| 8 |
| 15 |
| 5 |
| 32 |
| 9 |
| 10 |
| 1 |
| 6 |
=
| 8 |
| 15 |
| 5 |
| 32 |
| 32 |
| 30 |
=
| 8 |
| 15 |
| 1 |
| 6 |
=
| 16 |
| 5 |
点评:考查了运算定律与简便运算,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律简便计算.
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