(20+x)/(100+x)=1/2
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(20+x)/(100+x)=1/2
(20+x)/(100+x)=1/2
(20+x)/(100+x)=1/2
(20+x)/(100+x)=1/2
对角线相乘,得
2*(20+x)=1*(100+x)
40+2x=100+x
x=60
希望能够帮到您,
60
(20+x)/(100+x)=1/2
x/2+x/8+x/12+x/20=1
1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+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
设函数f(x)=(x-1)(x-2)...(x-100)(x>100),求F'(X)
f(x)=x(x-1)(x-2)…(x-99)(x-100),求f'(100)
2x(x-1)-x(3x+2)=(-x-1)(x+6)-20
解方程X(X+1)-X(X-3)=2(X+1)(X-1)+20
x(x+1)²-x(x²-3)-2(x+1)(x-1)=20
x-2=(104-x)+2 6x-59=10x-75 (x+10)+(x-15)=280-x4(x-62)=x-38 60x-40=(60+20)*(x-5) 32x+32*0.5-25x+64x=24x+496-49x x+15=3*(109-x ) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(2x+5)=17(x-2)-4(2x-1) (13x+8)/3=5x-1x-60=2[(3561-x)+100]+1 (x+9)+12=2[(x-9)-1
已知x^4+x^3+x^3+x^2+x^1+1=0,求x^100+x^99+x^98+x^97+x^96的值
(X+X)+(X-X)+(X*X)+(X/X)=100
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
X+25%X+15%X=420 2X+150=20501.5X-1200=(1+20%)2X-5+X=100
x(x-1)(x-2)...(x-99)(x-100)