| 计算下面各题(能简便的必须简便计算)。 | |||
| 420÷[(205-198)×4] | 9×(16+60)÷12 | 99×45 | 47×15+43×15 |
| 14×36+14×63+14 | 45×8×25 | 125×32×25 | (25+20)×4 |
| 解:(1)420÷[(205-198)×4], =420÷[7×4], =420÷28, =15; (2)9×(16+60)÷12, =9×76÷12, =684÷12, =57; (3)99×45, =(100-1)×45, =100×45-45×1, =4500-45, =4455; (4)47×15+43×15, =(47+43)×15, =90×15, =1350; (5)14×36+14×63+14, =14×(36+63+1), =14×100, =1400; (6)45×8×25, =45×2×4×25, =(45×2)×(4×25), =90×100, =9000; (7)125×32×25, =125×8×4×25, =(125×8)×(4×25), =1000×100, =100000; (8)(25+20)×4, =25×4+20×4, =100+80, =180 |
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