Question

-3/7 (2,1k-1 1/3n)-2,8 (2/7k-3,5n) якщо k=-100,n=0,35

Answer 1

Ответ:

166,77

Пошаговое объяснение:

При k=-100; n=0,35:

-3/7 ·(2,1k-1 1/3 ·n)-2,8(2/7 ·k-3,5n)=-3/7 ·(21/10 ·k -4/3 ·n) -14/5 ·(2/7 ·k -7/2 ·n)=-9/10 ·k +4/7 ·n -4/5 ·k -98/10 ·n=-k(9/10 +8/10)+n(40/70 -686/70)=(-17k)/10 -(323n)/35=(-17·(-100))/10 -(323·35)/(35·100)=170-3,23=166,77

Answer 2

To calculate the expression, substitute the given values of k and n into the expression:

k = -100 n = 0.35

-3/7 (2(1k)-1 1/3n) - 2.8 (2/7k - 3.5n)

First, let's compute the values inside the parentheses:

1k = 1 * -100 = -100 1/3n = (1/3) * 0.35 ≈ 0.1167

Now, replace k and n in the expression:

-3/7 (2(-100) - 1 1/3(0.35)) - 2.8 (2/7(-100) - 3.5(0.35))

Simplify further:

-3/7 (-200 - 0.1167) - 2.8 (-200/7 - 1.225)

Now, calculate the expressions inside the parentheses:

-3/7 (-200 - 0.1167) ≈ 86.693 -2.8 (-200/7 - 1.225) ≈ -558.464

Now, substitute the calculated values back into the original expression:

86.693 - 558.464

Finally, perform the subtraction:

Result ≈ -471.77

So, the value of the expression with k = -100 and n = 0.35 is approximately -471.77.