A note on the division of mathematical algebraic expressions
-7x2y (n+5xy-y) = (21x4y3-m+7x2y2), expand-7x2ym-35x3y2+7x2y2 = 21x. -7x^2ym=2 1x^4y^3； -n=-35x^3y^2； m=2 1x^4y^3/(-7x^2y)=-3x^2y^2。 N=35x^3y^2。 In the division formula, it is-3x2Y2; The quotient is 35x^3y^2.