(12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/07 15:33:04

(12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12
求X

(12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12
20(12x-10)+21(7x-9)=28(2-x)+35(8x-9)
240x-200+147x-189=56-28x+280x-315
387x-389=252x-259
135x=130
x=26/27

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 (12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 x^2+9x+8 x^2-6x+9 x^2-x-12 x^2+10x+21 x^2-20x-125 2x^2+5x+3 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10), (x^21+x^15+x^12+x^9+x^6+x^3+1)/(x^2+x+1) x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少 x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1 1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980