If b<2 and 2x-3b=0, which of the following must be true? A X>-3 B X<2 C x=3 D x<3 E x>3 答案D 我解出來答案為X=0 思路是: 2x-3b=0 b=2/3x 將 b代替成2/3x帶入3b 所以X=0 想請問哪裡不對了? 感激 ^___^
If b<2 and 2x-3b=0, which of the following must be true? A X>-3 B X<2 C x=3 D x<3 E x>3 答案D 我解出來答案為X=0 思路是: 2x-3b=0 b=2/3x 將 b代替成2/3x帶入3b 所以X=0 这个是不能解出x=0的,只能得出0=0。。。而且,你还有个关键条件b<2没用呢 想請問哪裡不對了? 感激 ^___^