5x+3.2x=32.8. 7.9x2-1.5x=5.3. 5x+2.4×1
5x+3.2x=32.8. 7.9x2-1.5x=5.3. 5x+2.4×1
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
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-x/5-x-5-x/1-x=8/x2-5x+5 解方程
已知X2-5X=3,求(X-1)(2x-1)-x(x+3)+15/x2-3的值
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
已知x2-5x=14,求2x2-x-2x+1-[x2+2x+1]+1的值.
化简求值:[3x/(x-1)-2x/(x+1)*(x2-1)/x 其中x=根号5 -5
x2-5x+1=0则x2+x2/1
函数f(x)=(x2-3x)/(x+1),x∈[0,5],求值域
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