1b
15.(2 + x) (x - 7) = 2 + x
16. x( 4x + 1) = 3x
我有d maths 唔識 大家可唔可以教吓我
2009-05-16 6:38 am
回答 (1)
2009-05-16 6:45 am
✔ 最佳答案
15.(2 + x) (x - 7) = 2 + x2 + x=0 或 x-7=1
x=-2 或 x=8
16. x( 4x + 1) = 3x
4x2+x=3x
4x2-2x=0
2x2-x=0
x(2x-1)=0
x=0或x=1/2
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https://hk.answers.yahoo.com/question/index?qid=20090515000051KK01765