Question

3(2m - 7n + 1) - (m - n), якщо m = 0,2; n = 1,7?

Answer 1

3(2m-7n+1)-(m-n) = 6m-21n+3-m+n=5m-20n+3, если m=0.2; n=1.7, то:

5×0.2 - 20×1.7 + 3 = 1-34+3 = -30

Ответ: -30

Answer 2

При m=0,2; n=1,7

$3(2 \times 0.2 - 7 \times 1.7 + 1) - (0.2 - 1.7) = 3(0.4 - 11.9 + 1) + 1.5 = 3 \times ( - 10.5) + 1.5 = - 31.5 + 1.5 = - 30$