Question

решите уравнение #618. плиз..​

Answer 1

Ответ:

Пошаговое объяснение:

$(1-\frac{7}{10})x=2\frac{1}{4} \\ \frac{3}{10}x=\frac{9}{4}\\x=\frac{9}{4}*\frac{10}{3}\\ x=\frac{15}{2}\\x=7\frac{1}{2}\\ \\(\frac{1}{4}+\frac{1}{5})x=1\frac{4}{5} \\ \frac{5+4}{20} x=1\frac{4}{5}\\ \frac{9}{20}x=\frac{9}{5}\\ x=\frac{9}{5}*\frac{20}{9} \\ x=4\\ \\ (3\frac{1}{8} +1\frac{3}{4})x=2\frac{1}{6}\\ (3+1+\frac{1+6}{8})x=2\frac{1}{6} \\ 4\frac{7}{8}x=2\frac{1}{6}\\x=2\frac{1}{6}:4\frac{7}{8}\\ x=\frac{13}{6} *\frac{8}{39}\\ x=\frac{4}{9}\\ \\(2\frac{1}{12} -1\frac{5}{6})x=\frac{3}{4} \\ (2\frac{1}{12} -1\frac{10}{12})x=\frac{3}{4} \\ \frac{3}{12}x=\frac{3}{4} \\ x=\frac{3}{4}*\frac{12}{3} \\ x=3$