\(=>Qthu\left(nuoc\right)=5.4200\left(tcb-40\right)\left(J\right)\)
\(=>Qthu\left(dong\right)=3.380\left(tcb-10\right)\left(J\right)\)
\(=>Qtoa\left(nhôm\right)=5.880\left(100-tcb\right)\left(J\right)\)
\(=>5.4200\left(tcb-40\right)+3.380\left(tcb-10\right)=5.880\left(100-tcb\right)\)
\(=>tcb\approx49^oC\)
(đề bài thiếu nhiệt dung riêng nên tui lấy C(nước)=4200J/kgK
C(đồng)=380J/kgK, C(nhôm)=880J/kgK)