Question

5. Обчислити: a) (20-22,05 : 2,1) · 6,4 +9,2 б) 0,5 40,1 - 27,04 : 2,6 6. Перетворіть у десятковий дріб: 3/4 , 9/20 7. Розв'язати рiвняння: 1,7 x = 11,05 Дії в стовпчик мають бути поряд із завданням​

Answer 1

Відповідь:

Покрокове пояснення:

  5.  a) (20-22,05 : 2,1) · 6,4 + 9,2 = 70 ;

            1)  22,05 : 2,1 = 220,5 : 21 = 10,5 ;     3) 9,5 * 6,4 = 60,8 ;

           2) 20 - 10,5 = 9,5 ;                               4) 60,8 + 9,2 = 70 .

       б) 0,5 * 40,1 - 27,04 : 2,6 = 20,05 - 10,4 = 9,65 .

  6.  3/4 = ( 3*25 )/( 4*25 ) = 75/100 = 0,75 ;

       9/20 = ( 9*5 )/( 20*5 ) = 45/100 = 0,45 .

  7.   1,7 x = 11,05 ;

             x = 11,05 : 1,7 ;

            x = 6,5 .

Answer 2

6. 3/4=0,75; 9/20=0,45
7. 1,7х=11,05
х=11,05/1,7
х=6,5

Answer 3

Answer in detail. 5. Calculate: a) (20-22.05 : 2.1) · 6.4 + 9.2 b) 0.5 + 40.1 - 27.04 : 2.6 6. Convert to decimal fraction: 3/4, 9/20 7. Solve the equation: 1.7 + x = 11.05 The actions in the column must be next to the task

Here is my answer:

5. a) (20-22.05 : 2.1) · 6.4 + 9.2 We can use the order of operations (PEMDAS) to simplify this expression. First, we perform the division inside the parentheses, then the multiplication, then the subtraction, and finally the addition.

(20-22.05 : 2.1) · 6.4 + 9.2 = (20 - 10.5) · 6.4 + 9.2 = 9.5 · 6.4 + 9.2 = 60.8 + 9.2 = 70

b) 0.5 + 40.1 - 27.04 : 2.6 We can also use the order of operations to simplify this expression. First, we perform the division, then the addition, and finally the subtraction.

0.5 + 40.1 - 27.04 : 2.6 = 0.5 + 40.1 - 10.4 = 40.6 - 10.4 = 30.2

6. Convert to decimal fraction: 3/4, 9/20 To convert a fraction to a decimal, we can divide the numerator by the denominator. We can use a calculator or long division to do this.

3/4 = 3 ÷ 4 = 0.75 9/20 = 9 ÷ 20 = 0.45

Therefore, 3/4 = 0.75 and 9/20 = 0.45 as decimal fractions.

7. Solve the equation: 1.7 + x = 11.05 To solve for x, we need to isolate it on one side of the equation. We can do this by subtracting 1.7 from both sides.

1.7 + x = 11.05 - 1.7 - 1.7 x = 11.05 - 1.7 x = 9.35

Therefore, x = 9.35 is the solution of the equation.