已知(2x-y-1)^2+(-x+2y-3)^2=0,你能求出x+y的值吗?(要求写明做题步骤,)
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已知(2x-y-1)^2+(-x+2y-3)^2=0,你能求出x+y的值吗?(要求写明做题步骤,)已知(2x-y-1)^2+(-x+2y-3)^2=0,你能求出x+y的值吗?(要求写明做题步骤,)已知
已知(2x-y-1)^2+(-x+2y-3)^2=0,你能求出x+y的值吗?(要求写明做题步骤,)
已知(2x-y-1)^2+(-x+2y-3)^2=0,你能求出x+y的值吗?(要求写明做题步骤,)
已知(2x-y-1)^2+(-x+2y-3)^2=0,你能求出x+y的值吗?(要求写明做题步骤,)
(2x-y-1)^2+(-x+2y-3)^2=0
2x-y-1-x+2y-3=0(把等式左右两边同时除以2)
x+y=4(等式的性质)
从题目已知可以看到,只能是
2x-y-1=-x+2y-3=0(第一式)
或
2x-y-1=-(-x+2y-3)=0(第二式)
由第二式解得,x+y=4
由第一式解得,x-y=-2/3 (不是题目要求的)
所以x+y=4
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