原式=18-(-3)×(-1/3)
[(-3)^2-(-5)^2]÷(-2)原式腊胡=(9-25)÷(-2)
(-2)^3×0.5-(-1.6)^2÷(-2)^2原晌虚式=(-8)×(1/2)-(-8/5)^2÷4
(-3/4)×(-8+2/3-1/3)原式=(-3/4)×(-8+1/3)
16÷(-2)^3-(-1/8)×(-4)原宴局燃式=16÷(-8)-1/2