1.(x+1)(x+2)+1/42.-x^4+16

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1.(x+1)(x+2)+1/42.-x^4+161.(x+1)(x+2)+1/42.-x^4+161.(x+1)(x+2)+1/42.-x^4+161、(x+1)(x+2)+1/4原式=(x&sup

1.(x+1)(x+2)+1/42.-x^4+16
1.(x+1)(x+2)+1/4
2.-x^4+16

1.(x+1)(x+2)+1/42.-x^4+16
1、(x+1)(x+2)+1/4
原式
=(x²+3x+2)+1/4
=x²+3x+9/4
=(x+3/2)²
2、-x^4+16
原式
=-(x^4-16)
=-(x²-4)(x²+4)
=-(x-2)(x+2)(x²+4)

(x+3/2)^2
(8+x^2)(8-x^2)=(8+x^2)(8^0.5+x)(8^0.5-x)