Question

-40*[-7x+5]=-1600 [-20x-50]*2=100 21*[4-6y]=-42 -3*[2-15x]=-6 0,5x+3=0,2x -0,4a-14=0,3a

Answer 1

Ответ:

Пошаговое объяснение:

-40*[-7x+5]=-1600

-7х+5=(-1600):(-40)

-7х:5=40

-7х=40*5

-7х=200

Х=-200/7=-28 4/7

[-20x-50]*2=100

-20х-5=100:2

-20х-5=50

-20х=50+5

-20х=55

Х=55:(-20)

Х=-2,75

21*[4-6y]=-42

4-6у=-42:21

4-6у=-2

-6у=-2-4

-6у=-6

У=-6:(-6)

У=1

-3*[2-15x]=-6

2-15х=-6:(-3)

2-15х=2

-15х=2-2

-15х=0

Х=0

0,5x+3=0,2x

0,5х-0,2х=-3

0,3х=-3

Х=-3:0,3

Х=-10

-0,4a-14=0,3a

-0,4а-0,3а=14

-0,7а=14

А=14:(-0,7)

А=-20

Answer 2

Let's solve each of the equations step by step:

1. -40 * [-7x + 5] = -1600

Distribute the -40 on the left side: 280x - 200 = -1600

Add 200 to both sides: 280x = -1400

Divide by 280: x = -1400 / 280 x = -5

2. [-20x - 50] * 2 = 100

Distribute the 2 on the left side: -40x - 100 = 100

Add 100 to both sides: -40x = 200

Divide by -40: x = 200 / -40 x = -5

3. 21 * [4 - 6y] = -42

Distribute the 21 on the left side: 84 - 126y = -42

Subtract 84 from both sides: -126y = -42 - 84 -126y = -126

Divide by -126: y = -126 / -126 y = 1

4. -3 * [2 - 15x] = -6

Distribute the -3 on the left side: -6 + 45x = -6

Subtract -6 from both sides: 45x = 0

Divide by 45: x = 0

5. 0.5x + 3 = 0.2x

Subtract 0.2x from both sides: 0.5x - 0.2x = -3

Combine like terms: 0.3x = -3

Divide by 0.3: x = -3 / 0.3 x = -10

6. -0.4a - 14 = 0.3a

Add 0.4a to both sides: -14 = 0.3a + 0.4a

Combine like terms: -14 = 0.7a

Divide by 0.7: a = -14 / 0.7 a = -20

So, the solutions to the equations are: x = -5 y = 1 x = 0 x = -10 a = -20