计算: 4 sin 60 ∘ - | - 2 | - 12 + ( - 1 ) 2016 .
(11·珠海)计算:
计算:.
(8分)先化简,再求值:,其中.
计算:
(10分)(1)计算:22+(-1)4+(-2)0-|-3|; (2)先化简,再求值:(4ab3-8a2b2)÷4ab+(2a+b)(2a-b),其中a=2,b=1.