Question

Сколько ! решите уравнения: а) х*12/17=28/51; б) х: 8/15=5/32; в) х/42=6/7; г) 56/х=16/21; д) 14/15*х=45/77; е) 63/88: х=54/121.

Answer 1

$a) \\ x* \frac{12}{17} = \frac{28}{51} \\ x= \frac{28}{51} * \frac{17}{12} \\ x= \frac{7}{9} \\ \\ x: \frac{8}{15} = \frac{5}{32} \\ x= \frac{5}{32} * \frac{8}{15} \\ x= \frac{1}{12} \\ \\ \frac{x}{42} = \frac{6}{7} \\ 7x=42*6 \\ 7x=252 \\ x=252:7 \\ x=36 \\ \\ \frac{56}{x} = \frac{16}{21} \\ 16x=56*21 \\ 16x=1176 \\ x=73,5 \\ \\$

$\frac{14}{15} x= \frac{45}{77} \\ x= \frac{45}{77} * \frac{15}{14} \\ x= \frac{675}{1078} \\ \\ \frac{63}{88} :x= \frac{54}{121} \\ x= \frac{63}{88} * \frac{121}{54} \\ x= \frac{847}{528} =1 \frac{319}{527}$