(x^+4x)^+7(x^+4x)+12

(x^+4x)^+7(x^+4x)+12 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*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1 2x+3x+4x+5x+x+6x+7x=100 X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9 x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少 x=x/6+x/12+x/7+5+x/2+4=? 1/6x+1/12x+1/7x+5+1/2x+4=x x²（x-1) - 4x(x-1) - 12