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Jawaban:

9.A=17/12

b=6

11.=117/20

12.=324/44

13.=a=7 2/3

b=6 2/5

c.=722/60

Penjelasan dengan langkah-langkah:

9.a.3/4×2/3=17/12

b.5/6×2/2×1/4=5/6×2/3=27/18×1/4=108/18:2=54/9:9=6

11.13/5+13/4=52/20+65/20=117/20

1213/3+11/4+7/2=13/3+11/4=52/22+33/12=85/12+7/2=170/44+154/44=324/44

13.a.4+3=7 2/3

b.3+3=6 2/5

c.19/3+11/5=95/10+33/15=125/15+14/4=512/60+210/60=722/60