(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=95
6x^2-13xy+6y^2-24x+11y-90=95-90=5
已知3x-2y=6,2x-3y=17,6x^2-13xy+6y^2-24x+11y-90=?
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