x/5 + 2x/3 = 39
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x/5+2x/3=39x/5+2x/3=39x/5+2x/3=39(X/5)*15+(2X/3)*15=39*153X+10X=58513X=585X=45通分得:13X/15=39x=45X=45X
x/5 + 2x/3 = 39
x/5 + 2x/3 = 39
x/5 + 2x/3 = 39
(X/5)*15+(2X/3)*15=39*15
3X+10X=585
13X=585
X=45
通分得:
13X/15=39
x=45
X=45
X=45
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
*-----------------------------------------------*| 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 ||
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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=?
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^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-2/5x-3=39
x/5 + 2x/3 = 39
解方程:3x(5-3x)-39=2x(7-2x)+5x(8-x)
2x(7-2x)+5x(8-x)=3x(5-3x)-39过程
x-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20
5x/(x-2)-2=3(x-2)/x