(x2+5x+3)(x2+5-2)-6,(x-1)(x+2)(x-3)(x+4)+24,3x2-2(2a+1)x+a2-
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(x2+5x+3)(x2+5-2)-6,(x-1)(x+2)(x-3)(x+4)+24,3x2-2(2a+1)x+a2-1,a2x+b2+(1-x) -(a+b)2x(1-x)-4b
(a2-a)x2-(ab+2b)x-6b2 用十字相乘法解决
(a2-a)x2-(ab+2b)x-6b2 用十字相乘法解决
(x2+5x+3)(x2+5x-2)-6
=(x²+5x)²+(x²+5x)-12
=(x²+5x+4)(x²+5x-3)
=(x+4)(x+1)(x²+5x-3)
(x-1)(x+2)(x-3)(x+4)+24
=(x²+x-2)(x²+x-12)+24
=(x²+x)²-14(x²+x)+48
=(x²+x-6)(x²+x-8)
=(x+3)(x-2)(x²+x-8)
3x2-2(2a+1)x+a2-1
=3x²-(4a+2)x+(a+1)(a-1)
=(3x-a+1)(x-a-1)
a2x+b2+(1-x) -(a+b)2x(1-x)-4b
(a2-a)x2-(ab+2b)x-6b2
=a(a-1)x²-(ab+2b)x-6b²
=(ax+2b)(ax-x-3b)
=(x²+5x)²+(x²+5x)-12
=(x²+5x+4)(x²+5x-3)
=(x+4)(x+1)(x²+5x-3)
(x-1)(x+2)(x-3)(x+4)+24
=(x²+x-2)(x²+x-12)+24
=(x²+x)²-14(x²+x)+48
=(x²+x-6)(x²+x-8)
=(x+3)(x-2)(x²+x-8)
3x2-2(2a+1)x+a2-1
=3x²-(4a+2)x+(a+1)(a-1)
=(3x-a+1)(x-a-1)
a2x+b2+(1-x) -(a+b)2x(1-x)-4b
(a2-a)x2-(ab+2b)x-6b2
=a(a-1)x²-(ab+2b)x-6b²
=(ax+2b)(ax-x-3b)
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
化简计算~1/(x2-5x+6) - 1/(4x-x2-3) - 1/(3x-x2-2)
5x2—[x2+(4x—x2)—2(x2—3x)]
1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21
已知A={x|x2-2x-80},C={x|x2-3ax+2a2
设集合A={x|x2-3x+2=0},B={x|x2+2(a+1)x+(a2-5)=0
设集合A={x|x2-3x+2=0},B={x|x2+2(a+1)x+(a2-5)=0}.
(x+1)2-2(x2-1)+(x-1)² (x2-3x+1)(x2-3x-3)-5 因式分解
x2+3x+9/x2-27+6x/9x-x2-x-1/6+2x 化简