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10分.急!*F.2 Maths { Identity & Factorization =] } 中英都得...Thx
吾該=]
Please give me some questions about Identities and Factorization. [ Including answers ]
1 Answer
- 1 decade agoFavorite Answer
Identity,恆等式.要去證明兩個數是否相等.
Example:
Provethat the following equation is identity.
(a) 5(x-2)=2(x-5)=3x
L.H.S=5(x-2)
=5x-10
R.H.S=2(x-5)=3x
2x-10=3x
=5x+10
L.H.S=R.H.S
answer: 5(x-2)=2(x-5)+3x ====個等號要三條線.
Prove that 3(x+1)+2(3x-5)=6(x-1)+10 is NOT identity.
L.H.S=3(x+1)+2(3x-5)
=3x+3+6x-10
6x+4
L.H.S.=R.H.S ====個等號中間要有條斜線.
3(x+1)+2(3x-5)=6(x-1)+10 is not identity.
Factorization.因式分解.
Example:
Factorize 14y^4 + 21y^3 -7y^2
= 7y^2 (2y^2) + 7y^2 (3y)-7y^2(1)
answer =7y^2 (2y^2+3y-1)
我都係讀緊中2,啱啱教完.Hope that can help you.