6x方-5x-1＞0 4x方+4x-15≤0 5x方-2x+3＞0 9x方+6x+1＞0 3x方-4x+5＜0 6x方+5x＜4 -x方+5x-5＞1
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6x方-5x-1＞04x方+4x-15≤05x方-2x+3＞09x方+6x+1＞03x方-4x+5＜06x方+5x＜4-x方+5x-5＞16x方-5x-1＞04x方+4x-15≤05x方-2x+3＞0
6x方-5x-1＞0 4x方+4x-15≤0 5x方-2x+3＞0 9x方+6x+1＞0 3x方-4x+5＜0 6x方+5x＜4 -x方+5x-5＞1
6x方-5x-1＞0 4x方+4x-15≤0 5x方-2x+3＞0 9x方+6x+1＞0 3x方-4x+5＜0 6x方+5x＜4 -x方+5x-5＞1
6x方-5x-1＞0 4x方+4x-15≤0 5x方-2x+3＞0 9x方+6x+1＞0 3x方-4x+5＜0 6x方+5x＜4 -x方+5x-5＞1
1.6x²-5x-1=(x-1)(6x+1)＞0,x＞1或x＜-1/6
2.4x²+4x-15=（2x-3)(2x+5)≤0,-2/5≤x≤2/3
3.9x²+6x+1=(3x+1)²＞0,x∈R
4.3x²-4x+5＜0,因为a=3＞0,△=-44＜0,所以x∈R
5.6x²+5x＜4,6x²+5x-4=(2x-1)(3x+4)＜0,-3/4＜x＜1/2
6.-x²+5x-6＞0,x²-5x+6=(x-2)(x-3)＜0,2＜x＜3
主要是会因式分解
4(X方+3X+1)方-(X方+X-4)方-(X方+5X+6)方因式分解
6x方-5x-1＞0 4x方+4x-15≤0 5x方-2x+3＞0 9x方+6x+1＞0 3x方-4x+5＜0 6x方+5x＜4 -x方+5x-5＞1
几道因式分解.x方-2x-3 x方+7x-18 x方-3x-4 x方+5x-6 x方-13x+36 2x方+3x+1
2（6X方+X）方-11（6X方+X）+5X四次方-10X方+9X三次方-7X方+12X（X+Y)方+2(X+Y)-15A四次方-21A方-100（X方+X）方-14（X方+X）+24X方（X-1）-Y方（X-1)
设x＞0,且x方-2x-9=0,求lg（x方+x-6）-lg（x方+4x+15）的值
5/x方+x-1/x方-x=0
已知x方-4x+1=0求x方+x方分之一
已知:x方+4x+1=0,求x方-x方分之一
因式分解x的5方-x的4方+x的3方-x的2方+x-1,
4x-x方-5
(x方+1)方-4x方,因式分解
解下列二元一次方程:6x方-7x+1=0和5x方-18=9x和4x方-3x=52
x方+x-1=0求2x立方+4x方+6
因式分解:(x方+y方)-4x方y方?
4x方-6x=0
解四道一元二次方程(1)6x方-7x+1=0(2)5x方-18=9x（3)4x方-3x=52（4）5x方=4-2x
x方-4x+1=0
因式分解 10X-4.9X方= X(X-2)+X-2= 4x方-1+= (X-4)方-(5-2x)方=