12.5乘7.2 怎么简便计算

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12.5乘7.2 怎么简便计算

12.5乘7.2 怎么简便计算
12.5乘7.2 怎么简便计算

12.5乘7.2 怎么简便计算
12.5*7.2=125*0.72=(125*8)*0.09=1000*0.09=90

12.5*7.2=12.5*8*0.9=90

12.5*8*0.9

12.5*7.2=12.5*8*0.9

(12*7)+(0.5*0.2)

12.5*7.2
=(12+0.5)*(7+0.2)
=12*7+12*0.2+0.5*7+0.5*0.2
=84+2.4+3.5+0.1
=90

12.5乘7.2
12.5*7.2
=1.25*10*8*0.9
=(5/4)*10*8*0.9
=2*5*10*0.9
=90

12.5*(7+2)
=12.5*7+12.5*0.2
=87.5+2.5
=90