1.If x is the largest number among three consecutive number , express their sum by an algebraic expression.
2.(4y+9)(y/2-3)=?
3.(x/3-y/2)(9x²+y/4-16)=?
寫步驟唔該.......
升丨既數學問題
2010-08-30 11:53 pm
回答 (1)
2010-08-31 12:05 am
✔ 最佳答案
1.x+(x-1)+(x-2)
=3x-3
2.
(4y*y/2)+9y/2+(-3*9)+(-3*4y)(將4項互相乘埋,2項*2項會得出4項)
=2y^2+4.5y-27-12y
3.同2(不過有2項乘3項=6頂)
=3x^3+xy/12-16x/3-4.5x^2y-y^2/8+8y
跟住同類項可以加埋，上面兩題都冇，唔可以加，加減号最易錯
最敬重既歷史人身緊係寫媽媽的養育之恩
2010-08-30 22:54:15 補充：
歷史人物最好的係孫中山先生，全靠我地先有今日，加d圖片同生平就可以架啦
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