270(x+15)-300x=x(x+15),会的话做960(x+20)-960x=4x(x+20)
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270(x+15)-300x=x(x+15),会的话做960(x+20)-960x=4x(x+20)
270(x+15)-300x=x(x+15),
会的话做960(x+20)-960x=4x(x+20)
270(x+15)-300x=x(x+15),会的话做960(x+20)-960x=4x(x+20)
270(x+15)-300x=x(x+15)
270X+4050-300X=X^2+15X
X^2+45X-4050=0
(X+90)(X-45)=0
X=-90或X=45
960(x+20)-960x=4x(x+20)
960X+19200-960X=4X^2+80X
4X^2+80X-19200=0
X^2+20X-4800=0
(X+80)(X-60)=0
X=-80或X=60
x+x=x+15
X(X-1)=X
(X+X)+(X-X)+(X*X)+(X/X)=100
2x(x-1)-x(2x-5)=15
x(x-1)=300
证明(x+1)(X+3)(x+5)(x+7)+15=(X+8x)+22(x+8x)+120
计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=?
解方程(x-3/x)-(3-x/x+1)=5x-15/2x+2
270(x+15)-300x=x(x+15),会的话做960(x+20)-960x=4x(x+20)
x>=1,x
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,
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程
x*x*x*x+2008x*x+2007x+2008(提示:x*x*x-1=(x-1)*(x*x+x+1))
x/x平方-x+2=2x/x+1
(X+1)X(X+2)X(X+3)=504
x/x+(1-x)/x-1/x
x*x*x*x*x=80000?