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题目简介
解方程组:-九年级数学
题目详情
答案
把③代入②,得2x2-x(x+1)-2=0,
解这个方程,得x1=-1,x2=2,
当x1=-1时,y1=-1+1=0,
当x2=2时,y2=2+1=3,
∴原方程组的解为