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2.-(-3+7-12+10)+(30-33+28)-(-21+20)=-2+25-(-1)=23+1=24
3.-(3/10-14/5)-(17/20-9/10+1)-2=-(0,3-2,8)-(0,85-0,90+1)-2=-(-2,5)-0,95-2=2,5-2,95= -0,45