⑴7142.85÷3.7÷2.7×1.7×0.7⑵4.83×-查字典问答网
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  ⑴7142.85÷3.7÷2.7×1.7×0.7⑵4.83×0.59+0.41×1.59+0.324×5.9⑶99×1.01×77.78+66.66×33.33⑷37.4×2.7+499×0.73+12.5×0.7

  ⑴7142.85÷3.7÷2.7×1.7×0.7

  ⑵4.83×0.59+0.41×1.59+0.324×5.9

  ⑶99×1.01×77.78+66.66×33.33

  ⑷37.4×2.7+499×0.73+12.5×0.7

1回答
2020-03-08 21:47
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康庭晓

  (1)7142.85÷3.7÷2.7×1.7×0.7.

  =7142.85÷37÷27×17×7

  =7142.85×7÷999×17

  =49999.95÷999×17

  =50.05×17

  =850.85

  (2)4.83*0.59+0.41*1.59-0.324*5.9

  =4.83*0.59+0.41*(1+0.59)-0.324*(10*0.59)

  =4.83*0.59+0.41+0.41*0.59-3.24*0.59

  =(4.83+0.41-3.24)*0.59+0.41

  =2*0.59+0.41

  =1.18+0.41

  =1.59

  (3)99×1.01×77.78+66.66×33.33

  =99×(1+0.01)×77.78+33.33×(2+1)

  =99.99×77.78+99.99

  =99.99×78.78

  =(100-0.01)×78.78=7878-0.7878

  (4)37.4×2.7+499×0.73+12.5×0.7

  =37.4*2+37.4*0.7+499*0.73+12.5*0.7

  =37.4*2+(37.4+12.5)*0.7+499*0.73

  =37.4*2+49.9*0.7+499*0.73

  =37.4*2+499*0.07+499*0.73

  =37.4*2+499*(0.07+0.73)

  =37.4*2+499*0.8

  =37.4*2+(500-1)*0.8

  =37.4*2-0.4*2+400

  =37*2+400

  =474

2020-03-08 21:48:49

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