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66SUPRA 77-33SUPRA55

Răspuns :

[tex] \frac{66}{77}- \frac{33}{55} = \frac{330}{385}- \frac{231}{385}= \frac{99}{385} [/tex]=[tex] \frac{9}{35} [/tex].
simplificam ambele fractii prin 11

[tex] \frac{6}{7}- \frac{3}{5}= \frac{30}{35}- \frac{21}{35}= \frac{9}{35} [/tex]