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1 ст. - х дм,
2 ст. - 3х дм,
3 ст. - (х + 23) дм,
х + 3х + (х + 23) = 108,
5х + 23 = 108,
5х = 108 - 23,
5х = 85,
х = 17 (дм) - 1 сторона,
3х = 3*17 = 51 (дм) - 2 сторона,
(х + 23) = 17 + 23 = 40 (дм) - 3 сторона,
проверка:
17 + 51 + 40 = 108,
108 = 108
1) (300км - 45 км) :3 ч = 255км : 3ч = 85км/ч. Ответ: Т.к. расстояние между городами было меньше 300км , то скорость поезда была меньше 85 км/ч.
962:9=106(ост.8)
962:9
9 :106
62
54
(8)
))))))))))))))))
509:5=101,8
509:5
5 :101,8
9
5
40
40
0
))))))))))))))))))
X-18=49
x=49+18
x=67
_________
67-18=49
49=49