解方程① ②(x-3)2="2(3-x)"
(6分×2)(1)计算:(2)解方程:
(本题共有2小题,每小题6分,共12分)计算:(1)4-(-4)+(-3); (2).
计算:.
(1)计算: (2)解方程:
计算:2sin60°+cos60°-3tan30°.