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M = s'/s
1)) s' = 20.15/20-15 = 300/5 = 60cm
m = 60/20 = 3
2)) S'= 60.180/60-180 = -90cm
m = -90/180 = -1/2
3)) s= 24.6/24-6 = 144/18 = 8
m = 24/8 = 3
4)) s'=25.20/25-20= 500/5 = 100
m = 100/25 = 4
lanjutin sendiri. lain kali jangan males ngerjain PRnya