(x-2y+3z)²
=x²+4y²+9z²-4xy+6xz-12yz;
(2x+3)²-(3x+2)²
=(2x+3+3x+2)(2x+3-3x-2)
=(5x+5)(1-x)
=5(1-x²)
=5-5x²;
(a-b)(x+y)-(b-a)(x+y)
=(x+y)(a+b-b+a)
=2a(x+y);
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(x-2y+3z)²
=x²+4y²+9z²-4xy+6xz-12yz;
(2x+3)²-(3x+2)²
=(2x+3+3x+2)(2x+3-3x-2)
=(5x+5)(1-x)
=5(1-x²)
=5-5x²;
(a-b)(x+y)-(b-a)(x+y)
=(x+y)(a+b-b+a)
=2a(x+y);
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,