1) 5y + 10,8=21,42
2)1,1 : (x + 9,14)=2,5
3) ( 139 - 23,48) : 38+4,35 *18=
2)1,1 : (x + 9,14)=2,5
3) ( 139 - 23,48) : 38+4,35 *18=
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5у=10,62
у=10,62/5
у=2,124
(139-23,48):38+4,35*18=115,52:38+78,3=3,04+78,3=81,34
Х+9,14=1,1÷2,5
Х+9,14=0,44
Х=0,44-9,14
Х=-8,7
Проверка :
1,1÷(-8,7+9,14)=2,5
1,1÷0,44=2,5
2,5=2,5.