题目内容
怎样简便就怎样算.
|
|
|
分析:(1)根据乘法分配律进行简算;
(2)先算减法,再算除法,最后算加法;
(3)根据乘法交换律和结合律进行简算.
(2)先算减法,再算除法,最后算加法;
(3)根据乘法交换律和结合律进行简算.
解答:解:
(1)
×
+
÷
+25%,
=
×
+
×
+
,
=(
+
+1)×
,
=
×
,
=
;
(2)
+(
-
)÷50%,
=
+
÷50%,
=
+
,
=
;
(3)
×25%÷
×25%,
=(
÷
)×(25%×25%),
=1×0.0625,
=0.0625.
(1)
| 5 |
| 8 |
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 1 |
| 4 |
| 1 |
| 4 |
| 8 |
| 3 |
| 1 |
| 4 |
=(
| 5 |
| 8 |
| 8 |
| 3 |
| 1 |
| 4 |
=
| 103 |
| 24 |
| 1 |
| 4 |
=
| 103 |
| 96 |
(2)
| 15 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 15 |
| 16 |
| 3 |
| 16 |
=
| 15 |
| 16 |
| 3 |
| 32 |
=
| 33 |
| 32 |
(3)
| 1 |
| 8 |
| 1 |
| 8 |
=(
| 1 |
| 8 |
| 1 |
| 8 |
=1×0.0625,
=0.0625.
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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