X*1.4+3=45
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(x-5)+(x-3)+x+(x+3)+(x+5)=45,x等于?
(4/x-5)+(x-3)/(12-x)=(x-45)/(x^2-17x+60)
X*1.4+3=45
X-20%X-7-(20%X+7-2)=X/3 X=45 “/”表示?
2.4x-1.4x+3x+2.4=0
2.4x-1.4x-3x=5.2-8
2.4x+1.4x+2.4=3x
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
3(x-1.4)+x=7.8
4x-1.4x-3x+2.4=02.4x-1.4x-3x+2.4=0
(x-2)/30+(x-3)/45+x/90=1
45/X-45/3X=3
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
3x=45÷x
3X+2*(45-x)=114
x/30+x/45=3
3x+8(10-x)=45