计算:sin60°﹣cot30°=____
Don’t ____ these plastic bottles. We can reuse them to make into a piece of cloth.
用配方法解一元二次方程x2﹣2x﹣5=0,下列配方正确的是( )
每张课桌60元,每把椅子15元,四一班用375元能购得____套桌椅。