2)....= -5.4+1.2-1.6+5.8-7.2=7.2
4)...=-7.8+16.3-45.12+8.3+4.7=-23.62
6)...= -5/2+5/6-0,3+5/3+21/5=-5/2+5/6-3/10+5/3+21/5=39/10
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2)....= -5.4+1.2-1.6+5.8-7.2=7.2
4)...=-7.8+16.3-45.12+8.3+4.7=-23.62
6)...= -5/2+5/6-0,3+5/3+21/5=-5/2+5/6-3/10+5/3+21/5=39/10