Решите уравнения: 1)х+5/7=(-3/8)*1целая 1/32)у-7/12=3целых1/2*(-4/7)3)(-5/14)*21/25-у=3 целых3/4

1) х+ 5/7 = (-3/8) * 1 1/3;
х + 5/7 = -3/8 * 4/3;
х + 5/7 = -12/32;
х + 5/7 = -4/8;
х = -4/8 - 5/7;
х = -(4 * 7)/(8 * 7) - (5 * 8)/(7 * 8);
х = -28/56 - 40/56;
х = -68/56;
х = -17/14;
х = -1 3/14.
Проверка:
-17/14 + 5/7 = (-3/8) * 1 1/3;
-17/14 + 10/14 = -3/8 * 4/3;
-7/14 = -12/32;
-1/2 = -4/8;
-1/2 = -1/2. Решение правильно.

2) у - 7/12 = 3 1/2 * (-4/7);
У - 7/12 = 7/2 * (-4/7);
У - 7/12 = -28/14;
У - 7/12 = - 2.
У = -2 + 7/12;
У = -1 12/12 + 7/12;
У = - 1 5/12.
Проверка:
-1 5/12 - 7/12 = 3 1/2 * (-4/7);
-17/12 - 7/12 = 7/2 * (-4/7);
-24/12 = -28/14;
-2 = -2. Решение верно.

3) (-5/14) * 21/25 - у = 3 3/4;
-(5 * 21)/(14 * 25) - у = 15/14;
-105/350 - у = 15/14;
-21/70 - у = 15/14;
-3/10 - у = 15/14;
-у= 15/14 + 3/10;
-у = (15 * 5)/(14 * 5) + (3 * 7)/(10 * 7);
-у = 75/70 + 21/70;
-у = 96/70;
у = -48/35;
у = -1 13/35.
Проверка:
(-5/14) * 21/25 - (-48/35) = 3 3/4;
-(5 * 21)/(14 * 25) - (-48/35) = 15/14;
-105/350 - (48/35) = 15/14;
-21/70 - (-48/35) = 15/14;
-21/70 + (48 * 2)/(35 * 2) = 15/14;
-21/70 + 96/70 = 15/14;
75/70 = 15/14;
15/14 = 15/14. Решение верно.