-2-【-2.2-(1-2)+2.4】×(-0.
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-2-【-2.2-(1-2)+2.4】×(-0.
-2-【-2.2-(1-2)+2.4】×(-0.
-2-【-2.2-(1-2)+2.4】×(-0.
原式=-2-[-2.2-(-1)+2.4]×(-1/4)
=-2-(-2.2+1+2.4)×(-1/4)
=-2-1.2×(-1/4)
=-2+0.3
=-1.7