3y(x-1)-x(3y-1)=2,求(x^2+9Y^2)÷6-xy如题
问题描述:
3y(x-1)-x(3y-1)=2,求(x^2+9Y^2)÷6-xy
如题
答
3y(x-1)-x(3y-1)=2
3xy-3y-3xy+x=2
x-3y=2
原式=(x²+9y²)÷6-6xy÷6
=(x²-6xy+9y²)÷6
=(x-3y)²÷6
=2²÷6
=2/3