Răspuns:
[tex]( \frac{13}{12} - \frac{7}{15} ) \div \frac{37}{30} + \frac{1}{2} = \\ ( \frac{195}{180} - \frac{84}{180} ) \div \frac{37}{30} + \frac{1}{2} = \\ \frac{111}{180} \times \frac{30}{37} + \frac{1}{2} = \\ \frac{333}{6660} + \frac{1}{2} = \\ \frac{333}{6660} + \frac{3330}{6660} = \\ \frac{3663}{13.320} [/tex]
(⁵13/12-⁴7/15):37/30+1/2=
12=4×3. 15=5×3
numitorul comun=5×4×3=60
(13×5-4×7)×30/(60×37)+1/2=
(65-28)×1/(2×37)+1/2=
37×1/(37×2)+1/2=1/2+1/2=2/2=1
