.....+5/7 = 47/56,jawabannya a.2/8, b.3/8, c.7/9, d.1/8, e.9/7

.....+5/7=47/56
×=47/56-5/7
×=47/56-40/56
×=7/56
×=1/8 {D}

Maaf ya kalau salah