1)сложите
[tex] \frac{5}{6} [/tex]
части от 30 и
[tex] \frac{7}{15} [/tex]
части от 75
2)Отнимите
[tex] \frac{3}{4} [/tex]
части от 800 и
[tex] \frac{7}{11} [/tex]

части от 660​
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