1.(2x-3y)²-(4y-3x)(3x+4y)2.(3a²+1/2b)(3a²-1/2b)(9a^4+1/4b²)3.(x+2)²(x-2)² 4.(3x-5y)²-(3x+5y)²5.(x+2y-3)(x+2y+3)6.(a-2b-2c)²

1.(2x-3y)²-(4y-3x)(3x+4y)2.(3a²+1/2b)(3a²-1/2b)(9a^4+1/4b²)3.(x+2)²(x-2)² 4.(3x-5y)²-(3x+5y)²5.(x+2y-3)(x+2y+3)6.(a-2b-2c)²
1.(2x-3y)²-(4y-3x)(3x+4y)
2.(3a²+1/2b)(3a²-1/2b)(9a^4+1/4b²)
3.(x+2)²(x-2)²
4.(3x-5y)²-(3x+5y)²
5.(x+2y-3)(x+2y+3)
6.(a-2b-2c)²

1.(2x-3y)²-(4y-3x)(3x+4y)2.(3a²+1/2b)(3a²-1/2b)(9a^4+1/4b²)3.(x+2)²(x-2)² 4.(3x-5y)²-(3x+5y)²5.(x+2y-3)(x+2y+3)6.(a-2b-2c)²
1.
原式=4x^2-12xy+9y^2-(12xy-9x^2+16y^2-12xy)
=13x^2-12xy-7y^2
2.
原式=( (9a^4-1)/4b^2 ) (9a^4+1/4b²)
=(81a^8-1/16b^4)
3
原式=（（x+2）（x-2））^2
=(x^2-4)^2
=x^4-8x^2+16
4
原式=(3x-5y+3x+5y)(3x-5y-3x-5y)
=6x*(-10y)
=-60xy
5
原式=(x+2y)^2-3^2
=x^2+4y^2+4xy-9
6
原式=a^2+4b^2+4c^2-4ab-4ac+8bc
有疑问请提出,

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