数学题初二的4(2x+3y)^2-9(2x-3y)^2 (x-y)^4+x(x-y)^3-y(y-x)^3
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数学题初二的4(2x+3y)^2-9(2x-3y)^2 (x-y)^4+x(x-y)^3-y(y-x)^3
1。4(2x+3y)^2-9(2x-3y)^2
2。(x-y)^4+x(x-y)^3-y(y-x)^3
1。4(2x+3y)^2-9(2x-3y)^2
2。(x-y)^4+x(x-y)^3-y(y-x)^3
4(2x+3y)^2-9(2x-3y)^2=【2(2x+3y)】2-【3(2x-3y)】2
=【2(2x+3y)+3(2x-3y)】【2(2x+3y)-3(2x-3y)】
=(4x+6y+6x-9y)(4x+6y-6x+9y)
=(10x-3y)(-2x+15y)
(x-y)^4+x(x-y)^3-y(y-x)^3=(x-y)3【(x-y)+x+y】
=2x(x-y)3
=【2(2x+3y)+3(2x-3y)】【2(2x+3y)-3(2x-3y)】
=(4x+6y+6x-9y)(4x+6y-6x+9y)
=(10x-3y)(-2x+15y)
(x-y)^4+x(x-y)^3-y(y-x)^3=(x-y)3【(x-y)+x+y】
=2x(x-y)3
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