5x+15>4x-13
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x
5x+15>4x-13
3x+2(4X+6)=3(6X-15)-13 3X-4(2X+5)=7(x-5)+4(2X+1)
[(x+3分之x+2)-(x+2分之x+1)+(x+5分之x+4)-(x+4分之x+3)]除以[(x平方+8x+15)分
通分x+4/x*x+4x与x-5/x(x-5)-2(x-5)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
∫(x^4-4x^2+5x-15)/(x^2+1)(x-2) dx=?
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
一元一次方程 5x+3=13 5x-1=4x+8 20+7x=27 7x+8x=15
3/7x+1/2x=13 x-1/5x=8/15 4x+5x=18/11