计算(x+2)(x-6)+16;(x-y)^2+4xy;2a(x^2+1)^2-2ax^2;25(a+b)^2-9(a-

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计算(x+2)(x-6)+16;(x-y)^2+4xy;2a(x^2+1)^2-2ax^2;25(a+b)^2-9(a-b)^2;(a+3b)^2-10(a+3b)+25

(x+2)(x-6)+16
=x^2-4x-12+16
=x^2-4x+4
=(x-2)^2
(x-y)^2+4xy
=x^2+y^2-2xy+4xy
=x^2+y^2+2xy
=(x+y)^2
2a(x^2+1)^2-2ax^2
=2a[(x^2+1)^2-x^2]
=2a(x^2+1-x)(x^2+1+x)
25(a+b)^2-9(a-b)^2
=[5(a+b)-3(a-b)][5(a+b)+3(a-b)]
=(5a+5b-3a+3b)(5a+5b+3a-3b)
=(2a+8b)(8a+2b)
=4(a+4b)(4a+b)
(a+3b)^2-10(a+3b)+25
=(a+3b-5)^2

因式分解 (1) ax^4-81a (2) 4x^2(x-y)+2x(x-y) (3) a^2x^2+4a^2xy+4a 因式分解.1.ax^2+(a^2+1)x+a 2.3x^2+5xy-2y^2+x+9y-4 3.4(x-y+1)+y(y 计算（1）x/x+y-x/x-y （2）a+2+4/a+2 （3）x^2-y^2/xy÷(x+y) 3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy 已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B 分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+ （x-A）*(B-y)=x^2-9xy+8y^2,求A,B A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x= 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x a*b=2×a+b 计算x*2x*3x*4x*5x*6x*7x*8x*9x=3039 x= 设A=2x-3xy+y+x-3y,B=4x-6xy+2y+4x-y,若|x-3a|+（y+3）=0,且B-2A=a.求A