计算 (1)(-4)×(-6) (2) ×(―) (3) 0÷(―2015) (4)(―0.25)÷(―4) (5)(―)×(―5)××(―2) (6)(―)÷(―)×(―) (7)(-36)×(―+)
解方程:
计算:
(本题6分) (1)已知:sinα·cos60º=,求锐角α; (2)计算:.
(1)(配方法) (2) (3)(4)()()—