(5x-30):3x=2:

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(5x-30):3x=2:
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(5x-30):3x=2:
(5x-30):3x=2:

(5x-30):3x=2:

15x-90=6x

3（5x-30）=6x
15x-6x=90
9x=90
x=10

解 方程两边同乘3x
得：5x-30=2x
3x=30
x=10
当x=10时 3x≠0
∴x=10是方程的解

3x分之5x—30=3分之2

化为分数后去分母就好做了，不能讲答案哦

x-2/5x-(x-2/5x)2/3-(2/5x-1/3x)=30求x 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 || (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-[2/5x+(x-2/5x-36)*2/3+36]=30 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-2/3x+x+2/7x=30 (5x-30):3x=2: 5x/(x-2)-2=3(x-2)/x 8x+3(x-2)=5x+(x-3)