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b) 3/10×2/5+1/4=
• 3/10×2/5=6/50
• 6/50+1/4= 12/100+25/100=37/100
c) 6/15÷1/2×4/5=
•6/15÷1/2=6/15×2/1=12/15
•12/15×4/5=48/75