Предмет: Математика, автор: posasi

Срочно, пожалуйста ​

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Ответы

Автор ответа: Zombynella
1

Ответ:

17,64.

Пошаговое объяснение:

№252

[63 и 9/20:(-4,7)+9,3] * (-4 и 1/5)=

1)63 и 9/20:(-4,7)=

=63 и 9/20:(-4 и 7/10)=

переведём в неправильную дробь:

=1269/20:(-47/10)=

= -(1269*10)/(20*47)=

сокращение 10 и 20 на 10, 1269 и 47 на 47:

= -27/2;

2) -27/2+9 и 3/10=

= -27/2+93/10=

=[( -27)*5+93]/10=

=(-135+93)/10=

= -42/10= -4,2;

3)(-4,2)*(-4 и 1/5)=

= (-4,2)*(-4,2)=

=17,64.

Автор ответа: Аноним
1

Решение задания прилагаю

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