题目内容
| 用你喜欢的方法计算. ①1375+450÷18 | ②101×43 | ③
| ||||||||||||||
| ④20.9+10.2÷(5.2-3.5) | ⑤
|
①1375+450÷18,
=1375+450÷(9×2),
=1375+450÷9÷2,
=1375+50÷2,
=1375+25,
=1400;
②101×43,
=(100+1)×43,
=100×43+1×43,
=4300+43,
=4343;
③
÷
÷
,
=
÷(
×
),
=
×
,
=
;
④20.9+10.2÷(5.2-3.5),
=20.9+10.2÷1.7,
=20.9+6,
=26.9;
⑤
×0.75+0.75×
,
=(
+
)×0.75,
=1×0.75,
=0.75.
=1375+450÷(9×2),
=1375+450÷9÷2,
=1375+50÷2,
=1375+25,
=1400;
②101×43,
=(100+1)×43,
=100×43+1×43,
=4300+43,
=4343;
③
| 7 |
| 9 |
| 2 | ||||
|
| 2 | ||||
|
=
| 7 |
| 9 |
| 2 |
| 3 |
| 2 |
| 3 |
=
| 7 |
| 9 |
| 9 |
| 4 |
=
| 7 |
| 4 |
④20.9+10.2÷(5.2-3.5),
=20.9+10.2÷1.7,
=20.9+6,
=26.9;
⑤
| 4 |
| 5 |
| 1 |
| 5 |
=(
| 4 |
| 5 |
| 1 |
| 5 |
=1×0.75,
=0.75.
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