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lk : 90 cm
ditny : km...?
jwb : km : lk/lb
: 90/30
3x
jadi keuntungan mekaniknya 3×
Lb ( Lengan Beban ) = 30 cm
Ditanya. : KM??
Dijawab : Km = Lk : Lb
= 90 : 30
= 3x