Question

（1）              (2)．      
( 3 )      （4）  (a+b-c)(a-b+c)
(5)[（2x+y）² - y(y+4x) - 8x]2x

Answer 1

（1）4a²+4ab+b², (2)1,( 3 ) a²bc⁶（4）a²-b²-c²+2bc(5) 2x-4

（1）=4a²+4ab+b²
(2)=2003²-(2003-1)(2003+1)= 2003²-(2003²-1²)=1
( 3 ) =a²bc⁶
（4）  (a+b-c)(a-b+c)=a²-b²-c²+2bc
(5)[（2x+y）² - y(y+4x) - 8x]2x=(4x²+4xy+y²-y²-4xy-8x) 2x
=(4x²-8x) 2x
=2x-4