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г)
[tex] \frac{4}{35} \times \frac{17}{18} + \frac{17}{18} \times \frac{31}{35} [/tex]
е)
[tex] \frac{72}{73} \times \frac{34}{65} + \frac{72}{73} \times \frac{39}{65} [/tex]
г)
[tex] \frac{4}{35} \times \frac{17}{18} + \frac{17}{18} \times \frac{31}{35} [/tex]
е)
[tex] \frac{72}{73} \times \frac{34}{65} + \frac{72}{73} \times \frac{39}{65} [/tex]
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Ответ:
г)4/35×17/18+17/18×31/35=17/18;
1)4/35×17/18=4×17/35×18=68/630=34/315;
2)17/18×31/35=17×31/18×35=527/630;
3)34/315+527/630=68+527/630=17/18;
е)72/73×34/65+72/73×39/65=1 551/4745;
1)72/73×34/65=72×34/73×65=2488/4745;
2)72/73×39/65=72×39/73×65=2808/4745=216/365;
3)2488/4745+216/365=2488+2808/4745=5296/4745=1 551/4745;
Вроде правильно.