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1/12+1/20+×.1/4=1/4
1/12+1/20-1/4=-1/4.×
mcm=3×2×2×5=3×4×5=12×5=60
12=3×2×2
20=2×2×5
4=2×2
5/60+3/60-15/60=-1/4×
-7/60÷-1/4=×
-7/15÷-1/1=×
7/15=×
7/15 partes queda