2a+4b=2(a+2b)
x+y
x+y
y-x
y-x
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3800÷20= 190
20800÷80=260
445000÷50=8900
14, 24, 34, 44, 54, 64, 74, 84, 94
Вот.......................
726000:120=6050
20*50=1000
6050-1000=5050
5050+150=5200