Question

Помогите пожалуйста
1.22

Answer 1

а) $\frac{6*20+7*12}{3*20-4*12}$ = $\frac{120+84}{60-48}$ = $\frac{204}{12}$ = 17

б) $\frac{6*2,4+7*0,8}{3*2,4-4*0,8}$ = $\frac{14,1+5,6}{7,2-3,2}$ = $\frac{19,7}{4}$ = 4,925

в) $\frac{6*10,8+7*6}{3*10,8-4*6\\}$ = $\frac{64,8+42}{32,4-24}$ = $\frac{22,8}{8,4}$ = $2\frac{5}{7}$

г) $\frac{6*12+7*5,6}{3*12-4*5,6} = \frac{72+39,2}{36-22,4} = \frac{32,8}{13,6} = 2\frac{7}{17}$