题目

25(x+y)^2+16(x-y)^2=
4y(y-x)^2-6y(x-y)^3=
(a-2b)^2+(a-2b)+1/4=

提问时间：2021-12-25

答案

1 25(x+y)^2+16(x-y)^2=25(x^+2xy+y^)+16(x^-2xy+y^)=25x^+50xy+25y^+16x^-32xy+16y^=41x^+18xy+41y^2 4y(y-x)^2-6y(x-y)^3=4y(y^-2xy+x^)-6y(x^3-3x^y+3xy^-y^3)=4y^3-8xy^+4x^y-6x^3y+18x^y^-18xy^3+6y^43 (a-2b)^...