当4x=5y时,y不等于0,则x²-y²/y²的值为?
问题描述:
当4x=5y时,y不等于0,则x²-y²/y²的值为?
答
4x=5yx=5/4y x²-y²/y² =x²-y²+2xy-2xy/y²=(x-y)²+2xy/y²,带入x=5/4y得:(5/4y-y)²+2 X 5/4y X Y/y...
当4x=5y时,y不等于0,则x²-y²/y²的值为?
4x=5yx=5/4y x²-y²/y² =x²-y²+2xy-2xy/y²=(x-y)²+2xy/y²,带入x=5/4y得:(5/4y-y)²+2 X 5/4y X Y/y...