题目内容
简便计算:
|
49.5×13.5+50.5×13-0.5×49.5. |
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算.
(2)根据乘法分配律进行计算.
解答:解:(1)
×(1-75%)+
+0.25×
,
=
×0.25+0.25+0.25×
,
=0.25×(
+1+
),
=0.25×2,
=0.5;
(2)49.5×13.5+50.5×13-0.5×49.5,
=49.5×13.5-0.5×49.5+50.5×13,
=49.5×(13.5-0.5)+50.5×13,
=49.5×13+50.5×13,
=(49.5+50.5)×13,
=100×13,
=1300.
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
=
| 7 |
| 8 |
| 1 |
| 8 |
=0.25×(
| 7 |
| 8 |
| 1 |
| 8 |
=0.25×2,
=0.5;
(2)49.5×13.5+50.5×13-0.5×49.5,
=49.5×13.5-0.5×49.5+50.5×13,
=49.5×(13.5-0.5)+50.5×13,
=49.5×13+50.5×13,
=(49.5+50.5)×13,
=100×13,
=1300.
点评:根据题意,找准所运用的运算定律,然后再进一步计算即可.
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