解方程,请看问题补充

问题描述:

解方程,请看问题补充
(1)2/3[3/2(x-2)-6]=2x-3
(2)(4-y/2)-(8-3y/10)=1-(8-2y/5)
(3)(3x-19)/4-(x-1)/8=1
(4)80%y+(500-y)60%=500*74%

(1)2/3[3/2(x-2)-6]=2x-3x-2-4=2x-3x= -3(2)(4-y/2)-(8-3y/10)=1-(8-2y/5)40-5y-80+3y=10-80+4y6y=30y=5(3)(3x-19)/4-(x-1)/8=1 6x-38-x+1=85x=45x=9(4)80%y+(500-y)60%=500*74%0.8y+300-0.6y=3700.2y=70y=350