(1) 8 + ( 1 2 ) - 1 - 2 cos 45 ° - ( π -2016 ) 0
(2)2y2+4y=y+2.
a - b 2 - a a - 2 b
( 9 x 4 - 15 x 2 + 6 x ) ÷ 3 x
1 2 x ( 2 x 2 - 4 x + 6 )
2 m + n 2 m - n
x y 2 x y 3