7.9×12.5 4.44×2.5 巧算
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![7.9×12.5 4.44×2.5 巧算](/uploads/image/z/1974797-53-7.jpg?t=7.9%C3%9712.5+4.44%C3%972.5+%E5%B7%A7%E7%AE%97)
7.9×12.5 4.44×2.5 巧算
7.9×12.5 4.44×2.5 巧算
7.9×12.5 4.44×2.5 巧算
7.9×12.5
=(8-0.1)x12.5
=8x12.5-0.1x12.5
=100-1.25
=98.75
4.44×2.5
=1.11x4x2.5
=1.11x10
=11.1
(8-0.1)*12.5=100-1.25= 98.75
4*2.5*1.11=10*1.11=11.1