| 你能用简便方法计算吗? 4.8×25 1.25×3.2 101×8.8 15.6×8.6+4.4×8.6 4×1.25×2.5×0.8. |
| (1)4.8×25 =1.2×(4×25) =1.2×100 =120; (2)1.25×3.2 =1.25×8×0.4 =10×0.4 =4 (3)101×8.8 =(100+1)×8.8 =100×8.8+8.8 =880+8.8 =888.8; (4)15.6×8.6+4.4×8.6 =(15.6+4.4)×8.6 =20×8.6 =172 (5)4×1.25×2.5×0.8 =4×2.5×(1.25×0.8) =10×1 =10. |
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