解方程x(1-15%)=595 2x+3y=140 2x+3=17 40x-32×38=704 x-0.8x=72 1.6(x=80)=20 x+2x=128.4 x(1-15%)=595 2x+3y=140 2x+3=17 40x-32×38=704 x-0.8x=72 1.6(x=80)=20 x+2x=128.4

解方程x(1-15%)=595 2x+3y=140 2x+3=17 40x-32×38=704 x-0.8x=72 1.6(x=80)=20 x+2x=128.4 x(1-15%)=595 2x+3y=140 2x+3=17 40x-32×38=704 x-0.8x=72 1.6(x=80)=20 x+2x=128.4

x(1-15%)=595 85%*x=595x=595*100/85=700x=700 2x+3y=1405x=140x=28 2x+3=17 x=7 40x-32×38=704 40x=704+32*38=1920x=48 x-0.8x=72 0.2x=72x=3601.6(x-80)=20 1.6x-128=20x=(20+128)/20=7.4 x+2x=128.43x=1…