7.9×12.5 4.44×2.5 巧算

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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