已知4x^2-9y^2=48,-2x+3y=4.求-2x-3y的值

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已知4x^2-9y^2=48,-2x+3y=4.求-2x-3y的值已知4x^2-9y^2=48,-2x+3y=4.求-2x-3y的值已知4x^2-9y^2=48,-2x+3y=4.求-2x-3y的值4

已知4x^2-9y^2=48,-2x+3y=4.求-2x-3y的值
已知4x^2-9y^2=48,-2x+3y=4.求-2x-3y的值

已知4x^2-9y^2=48,-2x+3y=4.求-2x-3y的值
4x^2-9y^2=48
(2x+3y)(2x-3y)=48
-(2x+3y)(3y-2x)=-48
-4(2x+3y)=-48
2x+3y=12
-2x-3y=-12