2x + 1 + 2y = 2x + 2y + 1
3x - (1 - 2 - x) = 3x - (-1 - x) = 3x + 1 + x = 4x + 1
30 кг
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60:12=5
5*6=30
15=5+5+5
15=3+3+3+3+3
15=1+1+1+1+1+1+1+1+1+1+1+1+1+1+1
35820
<u>7900</u>
27920
86
<u> 154</u>
240
150
<u>55</u>
95
13250
<u>820</u>
14070