Предмет: Алгебра, автор: тетерина8800

Решить примеры 7 класс алгебра
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Ответы

Автор ответа: AliceMagic
1
1)
 \frac{x + y}{7}
2)
 \frac{a + 3a}{b} = \frac{4a}{b}
3)
 \frac{(5x - 7) - (x - 3) + 2x - 8}{6x} = \frac{5x - 7 - x + 3 + 2x - 8}{6x} = \frac{6x - 12}{6x} = \frac{6(x - 2)}{6} = x - 2
4)
 \frac{a + 5b + 2a + 4b}{15} = \frac{3a + 9b}{15} = \frac{3(a + 3b)}{15} = \frac{a + 3b}{5}
5)x/3 + (x-2)/5=5x/15 + ([x-2]*3)/15=(5x+3x-6)/15=(8x-6)/15

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