计算: ( π - 2017 ) 0 + 6 sin 60 ∘ - | 5 - 27 | - 1 2 - 2 .
197×203
( 998 ) 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 )