Question

多项式（x^2-y^2)-4(2x^2-3y^2)化简的结果是多少

Answer 1

（x^2-y^2)-4(2x^2-3y^2)

=x^2-y^2-8x^2+12y^2

=x^2-8x^2-y^2+12y^2

=-7x^2+11y^2