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x+2y=1 3x+2y=﹣8 5x+4y=﹣3 3x﹣4y=﹣8
x+2y=1 3x+2y=﹣8 5x+4y=﹣3 3x﹣4y=﹣8
x+2y=1 3x+2y=﹣8 5x+4y=﹣3 3x﹣4y=﹣8
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)
y2+y-6=0 y2+y+6=0 y2-y-6=0 y2-y+6=0
步骤(1)(2)都不对 步骤(1)(2)都对 本题不适宜用加减消元法解 加减消元法不能用两次
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)