432+808Х=2048
808Х=1616
Х=1616/808
Х=2
6,52=6м 52см
5.015=5т 15кг
12-х-у, при х=5 3/4; у=7/12
12-5 3/4-7/12=12-23/4-7/12=(144-69-7)/12=5 8/12=5 2/3
3(2x+5)/8-2(5x+7)/3=7(x-15)/4-6 7/8
18x+45-80x-112=42x-630-91
-56x=-392
X=-392:-56
X=7
5679, 5680, 5681
5999, 5600, 5601
3398, 3399, 3400
7029, 7030, 7031
1499, 1500, 1501
12788, 12789, 12790
3998, 3999, 4000
9989, 9990, 9991