Question

45 баллов!!! 20 БАЛЛОВ! РЕШИТЕ КАК НА ФОТО
г) 5х - 8 = 3х - 8
д) 1/2х - 3 = 2 - 1/3 x
е) 5х - 2 1/4 = 1/2х
ж) 2/5х - 1 = 3/4х - 6
з) 2х - 3/5 = 3/4x - 1/2

Answer 1

Ответ:

г) 5х - 8 = 3х - 8

5x - 3x = -8 + 8

2x = 0 |:2

x=0

д)

$\frac{1}{2} x-3=2-\frac{1}{3} x\\\frac{1}{2}^{(*3} x+\frac{1 }{3}^{(*2} x=2+3\\\\\frac{3}{6} x+\frac{2}{6} x=5\\\\\frac{5}{6} x=\frac{5}{1} |:\frac{5}{6} \\x=\frac{5}{1}: \frac{5}{6} \\x=\frac{5}{1} * \frac{6}{5} \\x=\frac{5*6}{5}\\x=6$

е)

$5x-2\frac{1}{4} = \frac{1}{2}x\\\\5x-\frac{9}{4}=\frac{1}{2}x\\5x-\frac{1}{2}x=+\frac{9}{4}\\\frac{9}{2}x=\frac{9}{4} |:\frac{9}{2} \\x=\frac{9}{4}* \frac{2}{9} \\x=\frac{1}{2}$

ж)

$\frac{2}{5} x-1=\frac{3}{4} x-6\\\\\frac{2}{5}^{(*4} x-\frac{3}{4}^{(*5} x=-5\\\\\frac{8}{20}x- \frac{15}{20} x=-5\\-\frac{7}{20} x=-5 |*(-1)\\\frac{7}{20} x=5 |:\frac{7}{20}\\x=\frac{5}{1} *\frac{20}{7}\\x= \frac{100}{7}$

Пошаговое объяснение: