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计算下列各题,能简算的要简算.12%50×0.125×0.02×80.8×(4-3.75)×9.90.81×99+0.8125×(85+85+85+85)
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计算下列各题,能简算的要简算.12% 50×0.125×0.02×80.8×(4-3.75)×9.90.81×99+0.8125×(85+85+85+85) |
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答案和解析
(1).50×0.125×0.02×8, =(50×0.02)×(0.125×8), =1×1, =1; (2).0.8×(4-3.75)×9.9, =0.8×0.25×9.9, =0.2×9.9, =0.2×(10-0.1), =0.2×10-0.2×0.1, =2-0.02, =1.98; (3)0.81×99+0.81, =0.81×99+0.81×1, =0.81×(99+1), =0.81×100, =81; (4)25×(85+85+85+85), =25×4×85, =100×85, =8500. |
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