Question

решите уравнение ( 842 -844)​

Answer 1

Ответ:

-2-2

Пошаговое объяснение:

Answer 2

( 1 )

$\displaystyle\\\frac{x}{3}+\frac{x}{2}=\frac{x}{6}+1\\ \\ \frac{2x}{6}+\frac{3x}{6}= \frac{x}{6}+1\\ \\ \frac{5x}{6}=\frac{x}{6}+1\\ \\ \frac{5x}{6} -\frac{x}{6} =1 \\\\\frac{4x}{6}=1\\ \\\frac{2x}{3}=1\\ \\x=1:\frac{2}{3}\\ \\ x=\frac{3}{2}\\ \\x=1,5$

( 2 )

$\displaystyle\\\frac{y}{2} -\frac{y}{8} =\frac{y}{4} -1\\\\\frac{4y}{8} -\frac{y}{8} =\frac{2y}{8} -1\\\\\frac{3y}{8}=\frac{2y}{8}-1\\ \\ \frac{3y}{8} -\frac{2y}{8} =-1\\\\\frac{y}{8}=-1\\ \\y=-1:\frac{1}{8}\\ \\y=-8$

( 3 )

$\displaystyle\\\frac{5x}{12} -\frac{4x}{15} =\frac{x}{20} +1\\\\\frac{25x}{60} -\frac{16x}{60} =\frac{3x}{60} +1\\\\\frac{9x}{60} =\frac{3x}{60} +1\\\\\frac{9x}{60}-\frac{3x}{60}=1\\ \\ \frac{6x}{60} =1\\\\\frac{x}{10}=1\\ \\x=1:\frac{1}{10} \\\\x=10$

( 4 )

$\displaystyle\\\frac{x}{3} -\frac{2x}{9} =\frac{x}{6} +\frac{1}{2}\\ \\\frac{6x}{18} -\frac{4x}{18} =\frac{3x}{18} +\frac{1}{2}\\ \\\frac{2x}{18}=\frac{3x}{18}+\frac{1}{2}\\ \\ \frac{2x}{18} -\frac{3x}{18} =\frac{1}{2} \\\\-\frac{x}{18}=\frac{1}{2}\\ \\ x=\frac{1}{2} :(-\frac{1}{18} )\\\\x=-\frac{18}{2}\\ \\x=-9$