x²-4y²=(x+2y)(x-2y)=x-2y=3
∴﹛x-2y=3
x+2y=1
相加得2x=4
x=2
代入x-2y=3得
2-2y=3
y=-1/2
解二元二次方程 x的平方-4y的平方=3 x+2y=1
解二元二次方程 x的平方-4y的平方=3 x+2y=1
x的平方-4y的平方=3
x+2y=1
x的平方-4y的平方=3
x+2y=1
数学人气：971 ℃时间：2019-12-25 01:08:46
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