题目内容
简算:
①57.5-14.25-15
②102.31×59
③(
×10.68+8.52×
)÷1
④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0.12+…+0.98+0.99.
①57.5-14.25-15
| 3 |
| 4 |
②102.31×59
③(
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 5 |
④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0.12+…+0.98+0.99.
①57.5-14.25-15
| 3 |
| 4 |
=57.5-(14.25+15.75),
=57.5-30,
=27.5;
②102.31×59
=102.31×(60-1),
=102.31×60-102.31×1,
=6138.6-102.31,
=6036.29;
③(
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 5 |
=[
| 5 |
| 6 |
| 3 |
| 5 |
=
| 5 |
| 6 |
| 5 |
| 8 |
=10;
④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0.12+…+0.98+0.99
=(0.1+0.9)×9÷2+(0.1+0.99)×90÷2,
=4.5+1.09×45,
=4.5+49.05,
=53.55.
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