计算(x+6)(x+7)-(x-4)(x+3)

计算(x+6)(x+7)-(x-4)(x+3) (x-4)/(x-5)+(x-8)/(x-9)-(x-5)/(x-6)-(x-7)/(x-8)分式计算 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 计算:[(x^2 - 4)/(x^2 - x - 6) + (x+2)/(x-3)] / (x+1)/(x-3) 计算：(x+7)(x-6)-(x-2)(x+2) (x+5)(x+6)(x+7)(x+8) 简便计算 计算：﹙﹣x﹚^4·x^3-x^7-2x^3·(-x)^4 计算：(2x-1)^2-2(x-2)(x+6) 计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15) 1.用公式计算：COSX=1-X*X/2!X*X*X*X/4!-X*X*X*X*X*X/6!.直到最后一项的绝对 计算(x-2)(x-3)+2(x+6)(x-5)-3(x平方-7x+13) 计算,2/x(x+2)+2/(x+2)(x+4)+2/(x+4)(x+6) 计算：(2x+3)(3x-4)>(x+1)(x-1)+5x(x+3)+7 x^2+x-6分之x^2+3x-x^2-4分之x+2计算 计算：x^2-5x+6/x^2-x-2x^2-7x+12/x^2-2x-8 计算：x^2-5x+6/x^2-x-2x^2-7x+12/x^2-2x-8 x/x-3-5x/x^2-x-6计算 计算：x+6/x+5-x+7/x+6-x+8/x+7+x+9/x+8=? 计算1/x(x+2)+1/(x+2)(x+4)+1/(x+4)(x+6)+...1/(x+2004)(x+2006) 计算（x*x+4x+5）/（x+2）-（x*x+6x+10）/（x+3）+1