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b. -9 + 5 = -(9-5) = -4
c. -4 + (-7) = -(4+7) = -11
d. -4 + 10 = 10 - 4 = 6
e. 12 + (-7) = 12-7 = 5
f. 2+5+(-6)+2 = 2+2+5-6 = 9 -6 = 3
g. 5 + (-2) + (-3) + 5 = 5+5-5 = 5
h. -3 + 7 + (-4) + (-2) = 7 -(3+4+2) = 7 - 9 = -(9-7) = -2
i. -4+(-3)+(-6)+8 = -(4+3+6-8) = -(13-8) = -5
j. 2 +(-3)+(-6)+(-7) = -(3+6+7-2) = -(16-2) = -14
2) suhu = -15+19 = 19-15 = 4°C
3)
12 , 5, 10
7 , 9, 11
8, 13, 6
4) soal terpotong