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b. 63 - 13 = 50
c. -42 - 38 = -80
d. 85 - 9 + 168 - 124 = 76 + 24 = 100
=[28x(-15)]+48:(-6)
=[(-420):(-6)]+48
=70+48
=118
b. (-21)x(-3)-65:5
=(63:5)-65
=12.6-65
=42.4
c.168:(-4)-19x2
=(-42x2)-19
=-84-19
=-103
d. 85-36:4+(28x6)-124
=85-9+168-124
=120
maaf kalau ada yg salah. smg membantu