Предмет: Математика, автор: Лера2003111

вычислите 1/4+3/5, 9/11-2/5,

Ответы

Автор ответа: anastasia138
0
1/4+3/5=5/20+12/20=17/20
9/11-2/5=45/55-22/55=23/55
Автор ответа: esila00
0
1/4+3/5=5/20+12/20=17/20
9/11-2/5=45/55-22/55=23/55 ну как-то так
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Предмет: Математика, автор: Wonder2

В каком случае преобразование выполнено верно?

1)(5 + а)(а - 5) = 25 - а^2

2)(а - 1)(2 - 3а) = 5а - 2 -3а^2

3) -(a - 1)(2 - 3a) = (1 - a)(3a - 2)

4)(a +3)^2 =a^2 +3a + 9 

 
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