Theo bài ra ta có:
SBT-ST=H
SBT+ST+H=7104
=>SBT+ST+SBT-ST=7104
=>(SBT+SBT)+(ST-ST)=7104
=>2.SBT=7104
=>SBT=7104:2
=>SBT=3552
=>ST+H=7104-3552
=>ST+H=3552
Lại có:
ST-H=2141
=>ST=(3552+2141):2=2846,5
Vậy SBT=3552
ST=2846,5
SBT + ST + H = 7104
=> SBT + SBT = 7104 (vì ST + H = SBT)
=> 2 x SBT = 7104
=> SBT = 7104 : 2
=> SBT = 3552
=> ST + H = 3552
Mà ST - H = 2141
=> ST = (3552 + 2141) : 2 = 2846,5
KL: SBT = 3552
ST = 2846,5