Question

(500-в) :42=10
600-к*8=15*40

Answer 1

Ответ:

$(500-b) :42=10 \\ 500 - b = 42 \times 10 \\ 500 - b = 420 \\ - b = 420 - 500 \\ - b = - 80 \\ b = 80 \\ \\ 600 - k \times 8 = 15 \times4 0 \\ 600 - 8k = 600 \\ - 8k = 0 \\ k = 0$