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b)7-3-11+5 = -2
c)8-1-6=1
= 5 - (-6) -3 - (-2)
= 5 + 6 -3 +2
= 10
soal b
= 7 -3 -11 - (-5)
= 7 -3-11+5
= -2
soal c
= 8 - 1 - {(4-(-2)}
= 8 - 1 - {(4+2)}
= 8 - 1 - 6
= 1