9875
原式=125x(42-34)=125x8=1000 供参考.
原式=125x(79+21)=125x100=12500
=125*(79+9)=125*88=125*80+125*8=10000+1000=11000
125x79=125x(79+1)-125=10000-125=9875
原式=25x(4x8)x125x79=(25x4)x(8x125)x79=100x1000x79=100000x79=7900000供参考.
=25*4*8*125*79=100*1000*79=7900000
简便计算过程方法如下 解:125*79 =125*(80-1) =125*80-125*1 =10000-125 =9875
125 x 79= (100 + 25) x (80-1)= 100 x 80 + 25 x 80 - 100 - 25= 8000 + 25 x (4 x 20) - 125= 8000 + 100 x 20 -125= 8000 + 2000 - 125= 10000 - 125= 9875