已知3x-2y=6,2x-3y=17,6x^2-13xy+6y^2-24x+11y-90=?
问题描述:
已知3x-2y=6,2x-3y=17,6x^2-13xy+6y^2-24x+11y-90=?
答
(3x-2y)(2x-3y)=6x^2-13xy+6y^2=6*17=104, (1) 10(3x-2y)=10*6=60,3(2x-3y)=3*17=51, 3(2x-3y)-10(3x-2y)=-24x+11y=51-60=-9 ,(2)(1)+(2)=6x^2-13xy+6y^2-24x+11y=104-9=956x^2-13xy+6y^2-24x+11y-90=...