计算: - 1 4 - | 3 - 1 | + ( 2 - 1 . 414 ) 0 + 2 sin 60 ∘ - - 1 2 - 1
计算 (1). (2).
计算: (1) (2).
(1)计算:2sin60°+|-3|--()-1 (2)化简:3(x2+2)-3(x+1)(x-1)
(1)计算:; (2)解方程:.
计算: (1)(+-2.75)×(-24); (2)-32+(-2-5)÷7+|-|×(-2)2.