题目内容
计算下面各题,能简算的要简算.
| 82×99+82 | 28×25×8 |
| 450-(175+23+25) | (120-80÷16)×20. |
| (1)82×99+82 =82×(99+1) =82×100 =8200 (2)28×25×8 =28×25×4×2 =28×2×(25×4) =56×100 =5600 (3)450-(175+23+25) =450-(175+25+23) =450-(200+23) =450-223 =227 (4)(120-80÷16)×20 =(120-5)×20 =120×20-5×20 =2400-100 =2300 |
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