计算:(1) (2)(-5)×(-8)-(-28)÷4(3) (4)-2-(-2)-2×(-1)(5)+|-4|×0.5+2×(-1)
(8分)计算:
(本小题满分7分)计算:
计算: 2 - 1 + 9 - 2 cos 60 °
(本小题 7 分) 计算: