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(x²+x+6)(x²-x+6)=
(-5x+2y)²=
(-3m-4n)²=
(x+1)²-2x+1=
人气:172 ℃ 时间:2020-05-04 15:22:16
解答
(x²+x+6)(x²-x+6)
=(x²+6+x)(x²+6-x)
=(x²+6)²-x²
=x^4+12x²+36-x²
=x^4+11x²+36
(-5x+2y)²
=25x²-20xy+4y²
(-3m-4n)²
=9m²+24mn+16n²
(x+1)²-2x+1
=x²+2x+1-2x+1
=x²+2
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