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2.75x0.4的算式

解:原式=7.5*(1.9+0.4)+1.9*2.5+22.5*0.4 =7.5*1.9+7.5*0.4+1.9*2.5+22.5*0.4 =1.9*(7.5+2.5)+0.4*(7.5+22.5) =1.9*10+0.4*30 =19+12 =31

=4.05÷2.5x0.4 =4.05x0.4x4÷(2.5x4) =6.48÷10 =0.648 或者直接算=4.05÷2.5x0.4=1.62x0.4=0.648,望采纳!谢谢!

2.75*10.1=2.75*(10+0.1)=2.75*10+2.75*0.1=27.5+0.275=27.775

原式=2.75x(3.8+2.75) =2.75x 6.55 =18.0125

0.4:2.75=x:1.5 2.75x=0.4*1.52.75x=0.6 x=0.6/2.75 x=12/55

2.75X0.19+0.125X1.9=2.75*0.19+1.25*0.19=0.19*2.75+1.25)=0.19*4=0.76

2.5-0.25*0.4 =2.5*0.4-0.25*0.4 =1-0.1 =0.9

2.7510.1=2.75x(10+0.1)=2.75x10+2.75x0.1=27.5+0.275=27.775

0.3x=(210-x)*0.4, 0.3x=210*0.4-0.4x, 0.3x+0.4x=84, 0.7x=84, x=120 x=120,望采纳哦!谢谢!

(2.5 1.62)x0.4=(2.5*1.62)x0.4=2.5*0.4*1.62=0.1(25)*0.1(4)*1.62=(0.1*0.1)*(25*4)*1.62=0.01*100*1.62=1*1.62=1.62

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