帮忙写出下列方程式:1.铝,铜,NaOH 2.铝,铜,HCl 3.铝,铜,稀硝酸 所构成的原电池正,负极,总反应方程式.

(1)Al-3e- +4OH-=AlO2- +2H2O;2H2O+2e-=H2↑+2OH-;Al+2OH- +2H2O=2AlO2- +3H2↑
(2)Al-3e-=Al3+;2H+ +2e-=H2↑;2Al+6H+=2Al3+ +3H2↑
(3)Al-3e-=Al3+;4H+ +NO3- +3e-=NO↑+2H2O;Al+4H+ +NO3-=Al3+ +NO↑+2H2O