Ответ: в одном сантиметре 0.01 м
84:(6*2) = 7
84:6*2 = 28
45*12 = 540
45*2*6 = 540
18*15 = 270
18*10+5 = 185
28*9 = 252
<span>20*9+8*9 = 252</span>
У = 3/4 - 1/8 = 12/16 - 2/16 = 10/16 = 5/8
( 30 - n ) ÷ 2 = 9
30 - n = 9 · 2
30 - n = 18
n = 30 - 18
n = 12
Проверка:
( 30 - 12 ) ÷ 2 = 9
18 ÷ 2 = 9
9 = 9