解方程组2/5X-1/3Y+1=0,2X+2Y=7

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解方程组2/5X-1/3Y+1=0,2X+2Y=7解方程组2/5X-1/3Y+1=0,2X+2Y=7解方程组2/5X-1/3Y+1=0,2X+2Y=72/5X-1/3Y+1=0(1),2X+2Y=7(

解方程组2/5X-1/3Y+1=0,2X+2Y=7
解方程组2/5X-1/3Y+1=0,2X+2Y=7

解方程组2/5X-1/3Y+1=0,2X+2Y=7
2/5X-1/3Y+1=0(1),2X+2Y=7 (2)
则 x=7/2-y (3)代入(1)解得y=36/11 代入(3)得 x=5/22