帮我转换英尺单位Size 尺寸(Inch) 6 x 4 x 14 9 x 5 x 17 11 x 7 x22.5 13

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? 3.504 inch OD x 4.0 inch 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-4)/(x-5)+(x-8)/(x-9)-(x-5)/(x-6)-(x-7)/(x-8)分式计算 求方程解x-5/x-4+x-9/x-8=x-8/x-7+x-6/x-5 x-4/x-5-x-7/-x-8=x-5/x-6-x-8/x-9 解分式方程：(x-4)/(x-5)+(x-8)/(x-9)=(x-7)/(x-8)+(x-5)/( x-6) 解分式方程（X-4)/(X-5)-(X-5)/(X-6)=(X-7)/(X-8)-(X-8)/(X-9)