解: 179×83
=179×(80+3)
=179×80+179×3
=14320+537
=14857
89×72
=(90-1)×72
=90×72-72
=6480-72
=6408
179*83
=179*(或旁80+3)
=179*80+179*3
=14320+537
=14857
89*72
=(90-1)缓团如扰启*72
=90*72-72
=6480-72
=6408
179×83
=179×(漏春80+3)
=179×80+179×3
= 14 320+ 537
=14857
89×72
=(90-1)改搜亩核森×72
=90×72-72
= 6480-72
=6408
掏出手机拨打过去
179*83 = (131+48)*(肆型笑131-48)
=(租枯130+1)裂含*(130+1)-(50-2)*(50-2)
=16900+260+1 -(2500-200+4)
=16900-2300 + 260+1-4
=14600+260-3
=14860-3
=14857
89*72=(80+9)(80-8)
=6400 + 80 -72
=6400+8
=6408