Question

СРОЧНО
г)
$\frac{4}{35} \times \frac{17}{18} + \frac{17}{18} \times \frac{31}{35}$
е)
$\frac{72}{73} \times \frac{34}{65} + \frac{72}{73} \times \frac{39}{65}$
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Answer 1

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.

Answer 2

$\frac{4}{35}*\frac{17}{18} + \frac{17}{18}*\frac{31}{35} = \frac{17}{18}*(\frac{4}{35} + \frac{31}{35}) = \frac{17}{18}\\ \\ \frac{72}{73}*\frac{34}{65} + \frac{72}{73}*\frac{39}{65} = \frac{72}{73}*(\frac{34}{65} + \frac{39}{65}) = \frac{72}{73} * \frac{73}{65} = \frac{72}{65}$