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B. R= 15 + 25 - 45 = -5 N ( 5N KEKIRI)
C. R= 55-(30+40)=-15 N( 15 N KEKIRI)
D. R= 50+ 10 - 40 = 20 N ( KEKANAN)
B. 15+25-45 = -5 N
C. 30+40-55 = 15 N
D. 50+10-40 = 20 N
Jadi yg terbesar adalah A