-5二次方-[(-2)三次方+(1-0.8*3/4)/(-2二次方)*(-2)]
= -25-[-8+(1-0.2*3)/4*(-2)]
=-25-[-8+0.4/4*(-2)]
= -25-[-8+0.1*(-2)]
= -25-(-8-0.2)
= -25+8.2
= -16.8
-5二次方-[(-2)三次方+(1-0.8*3/4)/(-2二次方)*(-2)]
= -25-[-8+(1-0.2*3)/4*(-2)]
=-25-[-8+0.4/4*(-2)]
= -25-[-8+0.1*(-2)]
= -25-(-8-0.2)
= -25+8.2
= -16.8