Question

0,7(2 c-9k)-40(0,25c-k),если c=0,7;k=0,4

Answer 1

Ответ:

7,04

Пошаговое объяснение:

1.4c-6.3k-10c+40k

при с=0,7 k=0,4

1.4*0.7-6.3*0.4-10*0.7+40*0.4=0.56-2.52-7+16=7.04

Answer 2

To evaluate the expression 0.7(2c - 9k) - 40(0.25c - k) when c = 0.7 and k = 0.4, follow these steps:

Step 1: Substitute the given values of c and k into the expression: c = 0.7 k = 0.4

Step 2: Calculate the values inside the parentheses: 2c - 9k = 2(0.7) - 9(0.4) 2c - 9k = 1.4 - 3.6 2c - 9k = -2.2

0.25c - k = 0.25(0.7) - 0.4 0.25c - k = 0.175 - 0.4 0.25c - k = -0.225

Step 3: Substitute the calculated values back into the original expression: 0.7(2c - 9k) - 40(0.25c - k) = 0.7(-2.2) - 40(-0.225)

Step 4: Perform the multiplication: 0.7(-2.2) = -1.54 40(-0.225) = -9

Step 5: Calculate the final result: -1.54 - (-9) = -1.54 + 9 = 7.46

The final result is 7.46.