题目内容
简算:
|
4.7×1
|
分析:(1)根据连减的性质进行计算;
(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-
,
=
;
(2)4.7×1
+3.6÷
+(1+0.25)×13,
=4.7×1.25+3.6×1.25+1.25×13,
=(4.7+3.6+13)×1.25,
=21.3×1.25,
=26.625.
| 19 |
| 14 |
| 5 |
| 14 |
| 2 |
| 7 |
=
| 19 |
| 14 |
| 5 |
| 14 |
| 2 |
| 7 |
=1-
| 2 |
| 7 |
=
| 5 |
| 7 |
(2)4.7×1
| 1 |
| 4 |
| 4 |
| 5 |
=4.7×1.25+3.6×1.25+1.25×13,
=(4.7+3.6+13)×1.25,
=21.3×1.25,
=26.625.
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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