60(x+1)=90(x-1)
问题描述:
60(x+1)=90(x-1)
答
60x+60=90x-90
90x-60x=60+90
30x=150
x=5
答
60(x+1)=90(x-1)
则2(x+1)=3(x-1)
则2x+2=3x-3
解得x=5