nomor 5 yah pakai cara

3 4/10 : 9/30 x 0,45
= 3 2/5 : 3/10 x 45/100
= 17/5 x 10/3 x 45/100
= 17/1 x 1/3 x 9/10
= 153/30
= 5 3/30
= 5 1/10 (B)

34/10:9/30×45/100
=34/10×30/9×45/100
=102/90×45/100
=4590/9000
=2295/4500
=485/900