化简x(x-3)+2(x+5)-3(X2-7x+14)
化简x(x-3)+2(x+5)-3(X2-7x+14)
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
解方程5-x/x2-3x+2=5-x/x2-7x+h
2(x-3)(x+5)=x2+(x+2)(x-2)+(x+7)拜托各位大神
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
1.2-5x+x*x2.2x*x-5x+13.x*x-3/2*x-24.-x*x-4x+3
x2+3x+9/x2-27+6x/9x-x2-x-1/6+2x 化简
化简x2+3x+9/x2-27+6x/9x-x2-x-1/6+2x
3x2-[7x-(4x-3)-2x2]
不等式:(x2+3x+3)/(x2+2x+5)