49:X=2/7

x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? (x+7+x)^2=10(x+7)+x(x+7+x)^2=10(x+7)+xx^2+49+x^2=10x+70+x2x^2+49-10x-70-x=0求下面的过程 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 2x+3x+4x+5x+x+6x+7x=100 x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? (x+1)/(x+2)+(x+8)/(x+9)解答x+1/x+2+x+8/x+9=x+2/x+3+x+7/x+8 数学题求解解下列方程组x+y/2 +x-y/3=62(x+y)-x=-49x+7y=397x+9x=41 7x^2-5x=2x^2+x x-2/3x+x+2/7x=30 27046=2x( )+7x( )+4x( )+6x( ) 47026=4x()+7x()+2x()+6x() 2706=2x( )+7x( )+4x( )+6x( ) (x+7)(x+6)-(x-2)(x+1)=? (x-2)(x+1)(x+4)(x+7)=19 X-5+8*X=7*X-2*X-1 x-8/x-4=2-x-5/x-7