1. найдите произведение а) 5\9*7\8 б) 4\27*9\16 в)1 7\33*1 7\15 г)5 5\6*2 4\7 д)1...

Задание 1: найдите произведение
а) $\frac{5}{9}$ × $\frac{7}{8}$ = $\frac{5*7}{9*8}$ = $\frac{35}{72}$
б) $\frac{4}{27}$ × $\frac{9}{16}$ = $\frac{4*9}{27*16}$ = $\frac{1*1}{3*4}$ = $\frac{1}{12}$
в) 1 $\frac{7}{33}$ *1 $\frac{7}{15}$ = $\frac{40}{33}$ × $\frac{22}{15}$ = $\frac{40*22}{33*15}$ = $\frac{8*2}{3*3}$ = $\frac{16}{9}$ = 1 $\frac{7}{9}$
г) 5 $\frac{5}{6}$ × 2 $\frac{4}{7}$ = $\frac{35}{6}$ × $\frac{18}{7}$ = $\frac{35*18}{6*7}$ = $\frac{5*3}{1*1}$ = 15
д) 1 $\frac{5}{12}$ × 24 = $\frac{17}{12}$ × 24 = $\frac{17*24}{12}$ = $\frac{17*2}{1}$ = 34

Задание 2: выполни действия
а) 1 $\frac{1}{35}$ -(7-5 $\frac{4}{9}$ ) = - $\frac{166}{315}$
1. 7 - 5 $\frac{4}{9}$ = 7 - $\frac{49}{9}$ = $\frac{63}{9}$ - $\frac{49}{9}$ = $\frac{14}{9}$
2. 1 $\frac{1}{35}$ - $\frac{14}{9}$ = $\frac{36}{35}$ - $\frac{14}{9}$ = $\frac{36×9}{35×9}$ - $\frac{14×35}{9×35}$ = $\frac{324}{315}$ - $\frac{490}{315}$ = $\frac{324-490}{315}$ = - $\frac{166}{315}$

б) (4,5:1,8-1,05)-2,4= -0,95
1. 4,5÷1,8 = 2,5
2. 2,5 - 1,05 = 1,45
3. 1,45-2,4=-0,95