教教我!!!!

<= (小於or等於)
1 - 2(X+6)/7 <= 10-X
1<= 10-x +(2x+12)/7
1<= (70-7x+2x+12)/7
1<= (82-5x)/7
7<= 82-5x
-75 <= - 5x
-75/-5 =>x
x<= 15

希望幫到你=w=

2007-04-16 18:01:11 補充：
如2邊要除負數時 個小於or 等於號 要轉做大於or 等於號

2007-04-16 18:02:10 補充：
不大於 者係要小過10-x 或者係 等於10-x