Решите уравнение 1)х+(6 2/5-4,91)=5,35 2) у+(9,31-7 1/4)=8,2 3) (7,43-2 3/25)+х=7 4)

1) х + (6 2/5 - 4,91) = 5,35.

x = 5.35 - 6 2/5 + 4.91.

x = 10.26 - (6 * 5 + 2)/5.

x = 513/50 - 32/5.

x = 513/50 - (32 * 10)/50.

x = 513/50 - 320/50.

x = (513 - 320)/50.

x = 193/50 = 3 43/50.

Ответ: х = 3 43/50.

2) у + (9,31 - 7 1/4) = 8,2.

y = 8.2 - 9.31 + (7 * 4 + 1)/4.

y = - 1.11 + 29/4.

y = 7.25 - 1.11 = 6.14.

Ответ: у = 6,14.

3) (7,43 - 2 3/25) + х = 7.

x = 7 - 7.43 + (2 * 25 + 3)/25.

x = - 43/100 + 53/25.

x = - 43/100 + (53 * 4)/100.

x = - 43/100 + 212/100.

x = (212 - 43)/100.

x = 169/100 = 1.69.

Ответ: х = 1,69.

4) (8,61 - 3 3/4) + у = 12,1.

y = 12.1 - 8.61 + (3 * 4 + 3)/4.

y = 349/100 + 15/4.

y = 349/100 + (15 * 25)/100.

y = 349/100 + 375/100.

y = (349 + 375)/100.

y = 724/100 = 7.24.

Ответ: у = 7,24.