(x+1)(4x+1)-(2x-1)(2x+1) 怎么简算

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(x+1)(4x+1)-(2x-1)(2x+1) 怎么简算
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(x+1)(4x+1)-(2x-1)(2x+1) 怎么简算
(x+1)(4x+1)-(2x-1)(2x+1) 怎么简算

(x+1)(4x+1)-(2x-1)(2x+1) 怎么简算
(x+1)(4x+1)-(2x-1)(2x+1)
=4x²+x+4x+1-4x²+1
=5x+2;
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,

=(4x²+5x+1)-(4x²-1)
=4x²+5x+1-4x²+1
=5x+2

(x+1)(4x+1)-(2x-1)(2x+1)
=(x+1)(4x+1)-(4x²-1)
=4x²+5x+1-4x²+1
=5x+2

=(4x^2+5x+1)-(4x^2-1)
=5x+2
因为x=-2
所以原式=-8

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