续雨
花朵
共回答了21个问题采纳率:76.2% 举报
1(-7x^2y)(2x^2y-3xy^3+xy)
=-14x^4y^2+21x^3y^4-7x^3y^2
2.(x^4y+6x^3y^2-x^2y^3)/(3x^2y)
=1/3x^2+2xy-1/3y^2
3.(2m+n-p)(2m-n+p)
=(2m+n-p)(2m-(n-p))
=4m^2-(n-p)^2
=4m^2-n^2+2np-p^2
(-5x+3/2)(-5x-1.5)
=(-5x+1.5)(-5x-1.5)
=25x^2-2.25
1年前
6