Помогите плиз срочно

1) 3 * 5 целых 1/3 = 3 * 16/3 = 3/1 * 16/3 = 48/3 = 16
2) (6/7 + 4/21) * 42 = ( 18+4 /21) = 22/21 * 42 = 22 * 2 = 44
3) $7 \frac{7}{11} * \frac{5}{12} - 7 \frac{7}{11}* \frac{1}{12} = \frac{84}{11} * \frac{5}{12} - \frac{84}{11} * \frac{1}{12} = \frac{35}{11} - \frac{7}{11} = \frac{28}{11} = 2 \frac{6}{11}$
4) $3 \frac{1}{3} * 5 \frac{3}{4} + 4 \frac{2}{3} *5 \frac{3}{4} = \frac{10}{3} * \frac{23}{4} + \frac{14}{3} * \frac{23}{4} = \frac{230}{12} + \frac{161}{6} = \frac{230+322}{12} = \frac{552}{12}$

m + 2/3m - 5/9m = 5/3m - 5/9m = 10/9m= 1 целая 1/9m

Третий номер
12(2/3x+3/4x) = 34
8x + 9x = 34
17x = 34
x = 2 Ответ: 2

(4/5y - 3/7) *35 = 27
28y - 15 = 27
28y = 27 + 15
28y = 42
y = 42/28
y = 1.5