416

1)  -2.6-1.3+(-0.3)-9.7 = -4-10 = -14

2) -5.4-1.6+1.5+8.5= -7+10=3

3) -3.65-7.35+4.37+6.63=-11+11=0

4) -9.96-0.04+0.13-2.13=-10+(-2)=-10-2=-12

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418

-5, -4, -3, -2, -1, 0, 1, 2, 3.

-4+(-3)+(-2)+(-1)+0+1+2= -10+2= -8

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420

1) -9.65-4.35+5.31+2.69=-14+8=-6

2) -2.75-1.25+6.8+3.2=-4+10=6

3) 7 1\9 - 7 1\9 + (-5 1\6 - 4 2\6) = 0+(-31\6-26\6)=-57\6 = 9 3\6= 9 1\2 = 9.5