三道数学题，初二的，要过程，我会多多给分的！~~

来源：百度知道 编辑：UC知道 时间：2024/05/11 17:15:53
25(x+y)^2+16(x-y)^2=
4y(y-x)^2-6y(x-y)^3=
(a-2b)^2+(a-2b)+1/4=
是因式分解！！！

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^4

3
(a-2b)^2+(a-2b)+1/4
=a^-4ab+4b^+a-2b+1/4

25xx+50xy+25yy+16xx-32xy+16yy
41xx+18xy+41yy

4yyy-8yxy+4yxx-(6y[xxx-3xxy+3xyy-yyy])
4yyy-8xyy+4xxy-6xxxy+18xxyy-18xyyy+6yyyy

aa-4ab+4bb+a-2b+1/4

看得懂吧

1、 =25（x^2+2xy+y^2）+16(x^2-2xy+y^2)
=25x^2+50xy+25y^2+16x^2-32xy+16y^2
=41x^2+18xy+41y^2