160乘25%-1.3x=17.9 x/5-x/6=0.4 3(x+2)=40+11 0.3/0.5=x+1/2x-1 2.5/（x—0.5）=25% 1/3:0.25=80%：x

160*25%-1.3x=17.9
1.3x=40-17.9
x=22.1/1.3
x=17x/5-x/6=0.43(x+2)=40+110.3/0.5=x+1/2x-12.5/（x—0.5）=25%1/3:0.25=80%：x帮帮忙啊！ 急啊x/5-x/6=0.4x/30=0.4x=123(x+2)=40+11x+2=17x=150.3/0.5=x+1/2x-13x/2=8/5x=12/52.5/（x—0.5）=25%x-0.5=10x=10.51/3:0.25=80%：xx/3=0.25*0.8x=0.2*3x=0.6x/5-x/6=0.4x/30=0.4x=123(x+2)=40+11x+2=17x=150.3/0.5=x+1/2x-13x/2=8/5x=12/52.5/（x—0.5）=25%x-0.5=10x=10.51/3:0.25=80%：xx/3=0.25*0.8x=0.2*3x=0.6