题目内容
能简算要简算.
513×99+0.513×10;
2.5×1.25×
×8;
2.5-
×(1
-0.4)÷
.
513×99+0.513×10;
2.5×1.25×
| 2 |
| 5 |
2.5-
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
(1)513×99+0.513×10
=513×(100-1)+5.13
=513×100-513×1-5.13
=51300-513+5.13
=50787+5.13
=50792.13;
(2)2.5×1.25×
×8
=(2.5×
)×(1.25×8)
=1×10
=10;
(3)2.5-
×(1
-0.4)÷
=2.5-
×1÷
=2.5-
÷
=2.5-1
=1.5.
=513×(100-1)+5.13
=513×100-513×1-5.13
=51300-513+5.13
=50787+5.13
=50792.13;
(2)2.5×1.25×
| 2 |
| 5 |
=(2.5×
| 2 |
| 5 |
=1×10
=10;
(3)2.5-
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
=2.5-
| 2 |
| 5 |
| 2 |
| 5 |
=2.5-
| 2 |
| 5 |
| 2 |
| 5 |
=2.5-1
=1.5.
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