解方程18X+2/3X*8=2870 x-(1/4x+7)-[2/5(x-1/4x-7)+2]=5/18x

问题描述:

解方程18X+2/3X*8=2870 x-(1/4x+7)-[2/5(x-1/4x-7)+2]=5/18x

18X+2/3X*8=2870 70/3x=2870x=2870*3/70x=123x-(1/4x+7)-[2/5(x-1/4x-7)+2]=5/18xx-1/4x-7-2/5(x-1/4x-7)-2=5/18x3/5(3/4x-7)-2=5/18x9/20x-21/5-2=5/18x81/180x-50/180x=31/531/180x=31/5x=31/5*180/31x=36