2/5(X+3)=3/2X-2/3（X-7） 1.2y-1/0.3-1-y/0.6=y

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2/5(X+3)=3/2X-2/3（X-7） 1.2y-1/0.3-1-y/0.6=y
2/5(X+3)=3/2X-2/3（X-7） 1.2y-1/0.3-1-y/0.6=y

2/5(X+3)=3/2X-2/3（X-7） 1.2y-1/0.3-1-y/0.6=y
2/5(x+3)=3/2x-2/3(x-7)
12(x+3)=45x-20(x-7)
12x+36=45x-20x+140
12x-25x=140-36
-13x=104
x=-8
1.2y-1/0.3-1-y/0.6=y
2(1.2y-1)-(1-y)=0.6y
2.4y-2-1+y-0.6y=0
2.8y=3
y=30/28
y=15/14

*-----------------------------------------------*| 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 || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x(x-2)-2x(x+1)-3x(x-5) 其中x=负½ x-2x+3x-4x+5x.+99x-100x=25求解 2x+3x+4x+5x+x+6x+7x=100 x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? x^5-2x^3+x=? 写过程x(x-1)+2x(x+1)-3x(2x-5)-x(3x-2)+2x(2-x)=-5x(x-2)-4 x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x) x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 (x+3x+5x...+2009x)-(2x+4x+6x+...+2010x) x/x-3-5x/x^2-x-6计算 x^5-x^4+x^3-x^2+x-1 (X+1)X(X+2)X(X+3)=504