Question

448. Решите уравнения: 1) (11/1/2 + 3,75)- 2) 75)-(-x) = 4,5; 2 -(5² -1,6)-x=6 / : 3 3) x- 4) 4) 6 x-(-4,6+3 1/2) = C = -3,5; -8 1-1/4​

Answer 1

Пошаговое объяснение:

1)

(1 1/12 + 3,75) - (-х) = 4,5

1 1/12 + 3,75 + х = 4,5

1 1/12 + 3 3/4 + х = 4 1/2

1 1/12 + 3 9/12 + х = 4 6/12

4 10/12 + х = 4 6/12

х = 4 6/12 - 4 10/12

х = -4/12

х = -1/3

2)

-(5 2/3 - 1,6) - х = 6 1/3

-5 2/3 + 1 3/5 - х = 6 1/3

-5 20/30 + 1 18/30 - х = 6 10/30

-4 2/30 - х = 6 10/30

х = -4 2/30 - 6 10/30

х = -10 12/30

х = -10 2/5

3)

х - (7 5/9 - 5 1/6) = -3,5

х - 7 5/9 + 5 1/6 = -3 1/2

х - 7 10/18 + 5 3/18 = -3 9/18

х - 2 7/18 = -3 9/18

х = -3 9/18 + 2 7/18

х = -1 2/18

х = -1 1/9

4)

х - (-4,6 + 3 4/7) = -8 1/14

х + 4,6 - 3 4/7 = -8 1/14

х + 4 3/5 - 3 4/7 = -8 1/14

х + 4 42/70 - 3 40/70 = -8 5/70

х + 1 2/70 = -8 5/70

х = -8 5/70 - 1 2/70

х = -9 7/70

х = -9 1/10