因式分解 请初一数学高手为其解难 。。。。感谢啊

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1.
\uff083x²+2x-8\uff09²-\uff08x²-2x-8\uff09²
=(3x²+2x-8+x²-2x-8)(3x²+2x-8-x²+2x+8)
=(4x²-16)(2x²+4x)
=8(x²-4)(x²+2x)
=8x(x+2)(x-2)(x+2)
=8x(x+2)^2(x-2)
2.
(x+2)(x+3)+x²-4
=x^2+5x+6+x^2-4
=2x^2+5x+2
=(x+2)(2x+1)
3.
x²\uff08a-b)+16(b-a)
=(a-b)(x^2-16)
=(a-b)(x+4)(x-4)
4.
\uff08x²+2x\uff09²-7\uff08x²+2x)-8
=(x^2+2x-8)(x^2+2x+1)
=(x-2)(x+4)(x+1)^2
5.
(x²+9y²\uff09²-36x²y²
=(x²+9y²+6x²y²)(x²+9y²-6x²y²)
=(x+3y)^2(x-3y)^2
6.
\uff08x-1\uff09\uff08x-2y-1)+y²
=x^2-2xy-x-x+2y+1+y²
=x^2-2xy+y²-2x+2y+1
=(x-y)^2-2(x-y)+1
=(x-y-1)^2

1.A2-B2+B-1/4=A2-(B2-B+1/4)=A2-(B-1/2)2=(A+B-1/2)(A-B+1/2)

2.4(X2+Y)(X2-Y)-(2X2-Y)2=4(X4-Y2)-(4X4-4X2*Y+Y2)=-5Y2+4X2*Y
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x^2-13xy＋36y^2
=(x-4y)(x-9y)

( x^2＋4)-16x^2
=4-15x^2
=(2+ √15 x)(2- √ 15 x)

( x^2-5)^2＋8(x^2-5)
=(x^2 -5)(x^2 +3)

(x-1)(x-2)-2(2-x)^2
=(x-2)(x-1-2x+4)
=(x-2)(3-x)

72^2＋72*28＋28^2
=(72+28)^2-72*28
=10000-2016
=7984

45.8^2-2*45.8*35.8＋35.8^2
=(45.8-35.8)^2
=100

（X-4）*（x-9） （x+4）*（x-4)+4

x^2-13xy＋36y^2=(x-4)(x-9)

( x^2-5)^2＋8(x^2-5)
=(x^2-5)(x^2＋3)
(x-1)(x-2)-2(2-x)^2 =(x-2)(x-1-2(x-2))=(x-2)(3-x)
45.8^2-2*45.8*35.8＋35.8^2=(45.8+35.8)^2

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