【脱式计算(能简算的要简算).(1)12.5×(36-7.2-查字典问答网
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  【脱式计算(能简算的要简算).(1)12.5×(36-7.2)÷3.6(2)33.33×3334+22.22×9999(3)8.4×2012.1+(2012.1+12.5)×1.6(4)7.5×2.3+1.9×2.5+12.5×0.4(5)(1+1.2)+(2+1.2×2)+(3+1.2×3)+…】

  脱式计算(能简算的要简算).

  (1)12.5×(36-7.2)÷3.6

  (2)33.33×3334+22.22×9999

  (3)8.4×2012.1+(2012.1+12.5)×1.6

  (4)7.5×2.3+1.9×2.5+12.5×0.4

  (5)(1+1.2)+(2+1.2×2)+(3+1.2×3)+…+(99+1.2×99)+(100+1.2×100)

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2020-05-24 19:36
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江云波

  (1)12.5×(36-7.2)÷3.6,

  =12.5×36÷3.6-12.5×7.2÷3.6,

  =12.5×10-12.5×2

  =125-25,

  =100;

  (2)33.33×3334+22.22×9999,

  =33.33×3334+33.33×6666,

  =33.33×(3334+6666),

  =33.33×10000,

  =333300;

  (3)8.4×2012.1+(2012.1+12.5)×1.6,

  =8.4×2012.1+2012.1×1.6+12.5×1.6,

  =(8.4+1.6)×2012.1+12.5×0.8×2,

  =10×2012.1+10×2,

  =20121+20,

  =20141;

  (4)7.5×2.3+1.9×2.5+12.5×0.4,

  =2.5×6.9+1.9×2.5+5,

  =2.5×(6.9+1.9)+5,

  =2.5×8.8+5,

  =2.5×8×1.1+5,

  =20×1.1+5,

  =22+5,

  =27;

  (5)(1+1.2)+(2+1.2×2)+(3+1.2×3)+…+(99+1.2×99)+(100+1.2×100),

  =1+2+3+…+99+100+1.2×1+1.2×2+1.2×3+…+1.2×99++1.2×100,

  =(1+100)×100÷2+1.2×(1+100)×100÷2,

  =5050+6060,

  =11110.

2020-05-24 19:40:54

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