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Ответ

Ответ дан
ksenia162805

Пошаговое объяснение:

вариант 1

1:

1)2,9+(-6,1)=2,9-6,1=-3,2

2)-5,4+12,2=6,8

3)-8-(-5)=-8+5=-3

4)-12-15=-27

5)-6,7+6,7=0

6)8,5-(-4,6)=8,5+4,6=13,1

7)-4,2+(-5,2)=-4,2-5,2=-9,4

8)15-23=-8

2:

1)х+19=12

х=12-19

х=-7

2)-25-х=-17

-х=-17+25

-х=8

х=-8

3:

1)-34+67+(-19)+(-44)+34=67-34-19-44+34= 67-19-44=4

2)3+(-2)-(-1)=3-2+1=2

3)6+(-7)-(-15)-(-6)-30=6-7+15+6-30=-10

4:

-7,-6,-5,-4,-3,-2,-1, 1, 2, 3, 4, 5

-7+(-6)+(-5)+(-4)+(-3)+(-2)+(-1)+1+2+3+4+5=-7-6=-13

Вариант 2

1:

1)3,8+(-4,4)=3,8-4,4=-0,6

2)-3,8-(-6)=6-3,8=2,2

3)7,6-(-3,7)=7,6+3,7=11,3

4)-2+(-3)=-2-3=-5

5)-9,4+9,4=0

6)-7,3+15,1=15,1-7,3=7,8

7)-7-15=-22

8)54-72=-18

2:

1)х+23=18

х=18-23

х=-5

2)-31-х=-9

-х=-9+31

-х=22

х=-22

3:

1)-42+54+(-13)+(-26)+32=12-13-26+32=5

2)4+(-3)-(-2)=4-3+2=3

3)8+(-13)-(-11)-(-7)-42=8-13+11+7-42=-29

4:

-6,-5,-4,-3,-2,-1, 1, 2, 3, 4, 5, 6, 7, 8

-6+ (-5)+ (-4)+ (-3)+ (-2) + (-1)+1+2+3+4+5+6+7+8= 7+8=15

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