求解两元一次方程组,2x-5y=-3 5x-2y=-18 在线等++++++++++++++++++++++++++++++++++++++++
问题描述:
求解两元一次方程组,2x-5y=-3 5x-2y=-18 在线等++++++++++++++++++++++++++++++++++++++++
答
4x-10y=-6 1
25x-10y=-90 2
2-1
21x=-84
x=-4 y=1