(10x+x+2)^2-[x+10(x+2)]=138怎样解
问题描述:
(10x+x+2)^2-[x+10(x+2)]=138怎样解
答
10x+(x+2)]-[10(x+2)+x]=138 (11x+2)-(11x+20)=138 121x+33x-154=0 11x+3x-14=0 (11x+14)(x-1)=0 x>0 x=1 所以原来的数是31