Question

помогите пожалуйста​

Answer 1

Ответ:

Пошаговое объяснение:

1)  x+4,8=9,7,  x=9,7-4,8=4,9  или  x+4,8=-9,7,  x=-9,7-4,8=-14,5

2) 56x-91=108x-45,   56x-108x=91-45,  -52x=46,  x= -46/52,x= -23/26

3) x=-2 1/7-5 1/3=-2 3/21-5 7/21=-7 10/21

Answer 2

$\displaystyle \tt 1) \: |x+4,8|=9,7\\\\\displaystyle \tt x+4,8=9,7\\\displaystyle \tt x=9,7-4,8\\\displaystyle \tt x_1=4,9\\\\\displaystyle \tt x+4,8=-9,7\\\displaystyle \tt x=-9,7-4,8\\\displaystyle \tt x_2=-14,5$

$\displaystyle \tt 2) \: 7(8x-13)=9(12x-5)\\\displaystyle \tt 56x-91=108x-45\\\displaystyle \tt 56x-108x=-45+91\\\displaystyle \tt -52x=46\\\displaystyle \tt x=\frac{46}{-52}\\\displaystyle \tt x=-\frac{23}{26}$

$\displaystyle \tt 3) \: 5\frac{1}{3}+x=-2\frac{1}{7}\\\displaystyle \tt x=-\frac{15}{7}-\frac{16}{3}\\\displaystyle \tt x=-\frac{45}{21}-\frac{112}{21}\\\displaystyle \tt x=-\frac{157}{21}\\\displaystyle \tt x=-7\frac{10}{21}$