8/21 ÷ 15/28 ÷4/15 pakai cara ya!

8/21 : 15/28 : 4/15
= (8/21) x (28/15) x (15/4)
= (8/21) x (28/1) x (1/4)  → 15 dengan 15 dicoret
= 8/21 x 7                       →28/4
= 8/3



Semoga membantu

=> 8/21 ÷ 15/28 ÷4/15 
=> ((8/21) ÷ (15/28)) ÷ (4/15)
=> ((8*28):(21*15)) : (4/15)
=> (224:315):(4/15)
=> (225*15):(315*4)
=> 3360 : 1260 -----> dibagi 420
=> 8/3