0.8:15/4=[5-x]:0.75
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(1)2(x+15)-21=3x-15 (2)3(x+8)=5x+8 (3)4(x+5*0.8)=7x+5*0.8 (4
5x+7=2x+21,0.13x+12=0.8x-1,3(x-7)-(x-4)=15,解方程,急,
∫(x^4-4x^2+5x-15)/(x^2+1)(x-2) dx=?
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
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
0.75x-1/2x=-5;3x+5=4x+1;3X+5=4X+18;1-7x=x-7;9x+8-7x=3x;-(x-2
15-(4-5x)=2x+(35-3x)
4x+18=5x-15
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
5x+2x=33.6,7x-4x=0.75,2x+7x+2.1=12,56x-32x-119=361,解方程
四道方程:2x+6=5x 6x-28=2x 8(x-3.6)=0.8x 15x-110+7x=110