1.25×16简算

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1.25×16简算

1.25X4X4=5X4=20

=1.25x(8x2)=(1.25x8)x2=10x2=20

(1+0.25)*16=16+16*0.25=16+16\4=20

  1.25X4
  =1.25X(8X4)
  =(1.25X8)X4
  =10X4
  =40
  望采纳