5x+4x=45
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5x+4x=455x+4x=455x+4x=455x+4x=45（5+4）x=459x=459x÷9=45÷9x=59x\9=45\95x+4x=45(5+4)x=459x=45x=45÷9x=5
5x+4x=45
5x+4x=45
5x+4x=45
5x+4x=45
（5+4）x=45
9x=45
9x÷9=45÷9
x=5
9x\9=45\9
5x+4x=45
(5+4)x=45
9x=45
x=45÷9
x=5
(4/x-5)+(x-3)/(12-x)=(x-45)/(x^2-17x+60)
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x-2x+3x-4x+5x.+99x-100x=25求解
2x+3x+4x+5x+x+6x+7x=100
(x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)
x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
提取公因式:已知x*x-5x+1=0 求x*x*x-4x*x-4x-1
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
下列式子求导1.f(x)=x^3-3x^2+3x-22.g(x)=-3x^3+5x^2-4x+113.u(x)=-x^3+27x+74.h(x)=42-45x-3x^2+3x^35.f(x)=Lnx+x6.g(x)=x/(2+x^2)
一元二次方程解答!x（5x+4）=5x+44x^2-45=31x-3x^2+22x-24=0(x+8)(x+1)= -12(3x+2)(x+3)=x+14
x^-6x+5=x+4
5*4x+x*x=80
y=|-x.x+4x+5|
写过程x(x-1)+2x(x+1)-3x(2x-5)-x(3x-2)+2x(2-x)=-5x(x-2)-4
5x+4x=45
X一20%X=4 5分之X加上X=60X一20%X=45分之X加上X=60
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