3x+3/1(100-x)=100
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3x+3/1(100-x)=100
3x+3/1(100-x)=100
3x+3/1(100-x)=100
3x+1/3(100-x)=100 1/3表示3分之1
9x+100-x=300
8x=200
x=25
3x²-(2x+5x-1),其中x=10
x+2x+3x+.+100x
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X×X-3X+1=0求分式X×X÷〈X×X×X×X+3X×X+1〉
已知f(x-1)=x²+4x-5则f(x)的表达式是() A x²+6x B x²+8x+7已知f(x-1)=x²+4x-5则f(x)的表达式是()A x²+6xB x²+8x+7C x²+2x-3D x²++6x-10
1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+...+1/(x+100)(x+101)
1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+1/(X+99)(X+100)=
求解 1/X(X+3)+1/(X+5)(X+6)+……+1/(X+99)(X+100)
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
1X+2X+3X…+98X+99X+100X=50500X X等于多少?
1x+2x+3x+4x+5x+6x+7x…+99x=100
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3x(x的2次方-x-1)(x+1)(3x-3)其中x=-1
(1) √3_____{x|x≤2},(1,2)____{(x,y)|(1) √3_____{x|x≤2},(1,2)____{(x,y)|y=x+1}(2) √2+√5_____{x|x≤2+√3}(3) {x|x/1=x,x∈R}______{x|x的立方-x=0}(4)设U=R,A={x|a≤x≤b}