Question

Раскройте скобки и превидите подобные слагаемые: а)(х+2,6)-(х+4,8) б)-(х-4,7)-(4,7-х) в)5*(7у-2)+21 за правельный ответ дам 15 баллов

Answer 1

А)(х+2,6)-(х+4,8)=х+2,6-х-4,8=-2,2
б)-(х-4,7)-(4,7-х)=-х+4,7-4,7+х=0
в)5*(7у-2)+21=35y-10+21=35y+11

Answer 2

Раскрытие скобок и приведение подобных слагаемых:

а) (х + 2.6) - (х + 4.8)

To simplify this expression, we need to distribute the negative sign to both terms inside the parentheses:

х + 2.6 - х - 4.8

Next, we can combine like terms by adding or subtracting coefficients of similar variables. In this case, both terms have the variable 'х':

(х - х) + 2.6 - 4.8

Since х - х equals zero, the expression simplifies to:

0 + 2.6 - 4.8

Finally, we can subtract 4.8 from 2.6 to get the final result:

2.6 - 4.8 = -2.2

Thus, the simplified expression is -2.2.

б) (х - 4.7) - (4.7 - х)

To simplify this expression, we need to distribute the negative sign to both terms inside the parentheses:

х - 4.7 - 4.7 + х

Next, we can combine like terms by adding or subtracting coefficients of similar variables. In this case, both terms have the variable 'х':

(х + х) - 4.7 - 4.7

Since х + х equals 2х, the expression simplifies to:

2х - 4.7 - 4.7

Finally, we can subtract 4.7 from 4.7 to get the final result:

2х - 9.4

Thus, the simplified expression is 2х - 9.4.

в) 5 * (7у - 2) + 21

To simplify this expression, we need to distribute the number 5 to both terms inside the parentheses:

35у - 10 + 21

Next, we can combine like terms by adding or subtracting coefficients:

35у + 11

Thus, the simplified expression is 35у + 11.

Оценка правильности ответа:

Правильные ответы: а) -2.2 б) 2х - 9.4 в) 35у + 11

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