0,25:2 1per4+30%×1 2per5 =tolong cara jalannya gan

0,25 : 2 1/4 + 30% × 1 2/5

= 1/4 : 9/4 + 3/10 × 7/5
= 1/4 × 4/9 + 3/10 × 7/5
= 4/36 + 21/50
= 1/9 + 21/50 = 50/450 + 189/450 = 239/450