X + Y + Z = 1090
X + Y = 588 --> Y = 588 - X
Y + Z = 766 --> (588-X) + Z = 766 --> Z = 766 - 588 + X --> Z = 178 + X
..............................
X + ( 588 - X) + (178 + X) = 1090
X = 1090 - 588 - 178 = 324 слесарных
Y = 588 - 324 = 264 столярных
Z = 178 + 324 = 502 сапожных
Обычные, например 2x+3=0,2x+4+4x=0;
4 делителя....1, 2, 5, 10
49+51=100
59-34=25
7^2+2^2=49+4=53
(9+11)^2=20^2=400
5^2-4^2=25-16=9
(5-3)^2=2^2=4
4^3+3^3=64+27=91
(13+7)^3=20^3=8000
4^3-3^3=64-27=37
(49-46)^3=3^3=27