вычислите удобным способом: 1) -2,6+(-0,3)+(-1,4)+(-9,7) , 2) 1,5-5,4+(-1,6)+8,5, 3) 4,37+(-3,65)+(7,35) +6,63, 4) 0,13+(-9,94)+(2,13)+ (-0,06).
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2) 1,5+8,5-(5,4+1,6)=10,0-7,0=3,0
3) 4,37+6,63+(-3,65+3,65+3,70)= 11,0+3,70=14,70
4) 0,13+2,13+(-9,94-0,06)= 2,26+(-10,0)= -7,74