125*257+25*67
原式=(100+25)*257+25*67
=100*257+25*257+25*67
=25700+25*(257+67)
=25700+25*324
=25700+25*4*81
=25700+100*81
=25700*8100
=33800
125*257+25*67
原式=(100+25)*257+25*67
=100*257+25*257+25*67
=25700+25*(257+67)
=25700+25*324
=25700+25*4*81
=25700+100*81
=25700*8100
=33800