F2 MATH!!!!(20points)

((a-b)+c)^ 應該係 [(a-b)+c]²吧 = =

[(a-b)+c]²
=(a-b)² + 2(a-b)(c) +c²..................a²+2ab+b²=(a+b)²
=a²-2ab+b² +2c(a-b) +c²................a²-2ab+b²=(a-b)²
=a²-2ab+b² +2ca-2cb +c²
=a²+b²+c² -2ab+2ca-2cb

人地答晒你先答，而且二十分鐘內用六個化身去投票，仲大大聲話俾人聽會考數學得個 C，請問醜字點寫？

[(a-b) c]^2
=(a-b c)^2
=(a-b c)(a-b c)
=a^2 b^2 c^2 2ac-2ab-2bc

2008-11-19 15:20:10 補充：
Sorry!漏左加號
[(a-b)+c]^2
=(a-b+c)^2
=(a-b+c)(a-b+c)
=a^2+b^2+c^2+2ac-2ab-2bc

[(a – b) + c]2

= (a – b)2 + 2(a – b)c + c2

= a2 – 2ab + b2 + 2ac – 2bc + c2

= a2 + b2 + c2 – 2ab – 2bc + 2ac
=

((a-b)+c)^
=a^-b^+c^

((a-b)+c)^
= (a-b+c)^
= a^-b^+c^