348+6948简算(

简算有步骤78^87+87^78-69^96= -
78×87+87×78-69×96%D%A=87×2×(80-2)-96×(70-1)%D%A=174×80-174×2-96×70+96×1%D%A=13920-348-6720+96%D%A=13920+96-(348+6720%D%A=14016-7068%D%A=6948