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2.5 12.5x128简便计算

12.5x32x2.5 =12.5*8*4*2.5=100*10=1000 满意采纳奥

2.5x48x1.25=2.5*4*(8*1.25)*1.5=10*10*1.5=150

=12.5*2.5*(4*8) =(12.5*8)*(2.5*4) =100*10 =1000

=0.5*2.5*12.5*(4*4*8)=0.5*4*2.5*4*12.5*8=2*10*100=2000

简便运算为(12.5+2.5)*4=12.5*4+2.5*4=50+10=60答案是60

10

12.5x2.5x2.5=12.5x(2+0.5)x(2+0.5)=12.5x(4+2+0.25)=12.5x6+12.5x(0.2+0.05)=75+2.5+0.625=77.5+0.625=78.125

2.5*(6.32*12.5) 解:=2.5x(0.79x8x12.5)=2.5x0.79x(8x12.5)=2.5x(0.79x100)=2.5x79=2.5x(80-1)=2.5x80-2.5x1=2.5x4x20-2.5=200-2.5=197.5 祝学习进步.

解:原式=(2.5+12.5)*4*8 =4*2.5*8+12.5*8*4 =10*8+100*4 =80+400 =480祝你学习进步!望采纳

=2.5*4*12.5=10*12.5=125

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