ионно-электронный метод, помогите решить:

1)KMnO4+H2C2O4+H2SO4= MnSO4+K2SO4+CO2+H2O

2)KMnO4+NaOH+Na2SO3=K2MnO4+Na2SO4+Na2MnO4+H2O

3)KI+H2O2+H2o=KOH+I2

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