擅长因式分解的高手帮下忙.-9x²y+3xyzx(y-z)-y(z-y)81x四次方-y的四次方m²+7m-18（x+y）²+2(y+x)+1121(a-b)²-169(a+b)²5x²+6xy-8y²-a³-4a²+12a(a²+4)²-16a²4x²(a-b)+16y²(b-a)(x+1)(x+3)+1(x+y)²-4(x+y-1)计算.(-3)º+(-1/2)的-2次方÷23x²×（-3xy）²+(-2x)³×xy²4(a-b)²-(2a+b)(-b+2a)(x+y+2z)²(a+2b-3c)(a-2b+3c)(x+2y)(x-2y)-(x+2y)²+8y²(x+2y-3/2)(X+2y+3/2)4-(a+2)(a-2)(x²+y)(x²-y)-(-x²)×（-x²）(a+1)(4a-1)-(2a+1)(2a-1)(a-2)(a+2)(a²+4)(3m²+5)(-3m²+5)-m²(7m+4)(7m-4)-16m²简化,求值（2a-b）(b+2a)(b²+4a²).a=-1,b=-2已知(a

擅长因式分解的高手帮下忙.
-9x²y+3xyz
x(y-z)-y(z-y)
81x四次方-y的四次方
m²+7m-18
（x+y）²+2(y+x)+1
121(a-b)²-169(a+b)²
5x²+6xy-8y²
-a³-4a²+12a
(a²+4)²-16a²
4x²(a-b)+16y²(b-a)
(x+1)(x+3)+1
(x+y)²-4(x+y-1)
计算.(-3)º+(-1/2)的-2次方÷2
3x²×（-3xy）²+(-2x)³×xy²
4(a-b)²-(2a+b)(-b+2a)
(x+y+2z)²
(a+2b-3c)(a-2b+3c)
(x+2y)(x-2y)-(x+2y)²+8y²
(x+2y-3/2)(X+2y+3/2)
4-(a+2)(a-2)
(x²+y)(x²-y)-(-x²)×（-x²）
(a+1)(4a-1)-(2a+1)(2a-1)
(a-2)(a+2)(a²+4)
(3m²+5)(-3m²+5)-m²(7m+4)(7m-4)-16m²
简化,求值（2a-b）(b+2a)(b²+4a²).a=-1,b=-2
已知(a+b)²=9,（a-b）²=49.a²+b²= ,ab=
解方程4(x-2)(x+5)-(2x-3)(2x+1)=5
求2六次方+2的五次方+2的四次方+2³+2²+2+1的值和过程
2的2008次方+2的2007次方+2006次方+.+2²+2+1