文档介绍：27+456+7310--+++182+--+19+199912-163-237158+262+138      375+219+381+225     5001-247-1021-232 (181+2564+2719  378+44+114+242+222  276+228+353+219  (375+1034)+(966+125)   (2130+783+270)+1017   99+999+9999+99999  7755-(2187+755)            2214+638+286       3065-738-1065  899+344             2357-183-317-357      2365-1086-214 497-299             2370+1995              3999+498   1883-398            12×25                  75×24   138×25×4            (13×125)×(3×8)          (12+24+80)×50             704×25              25×32×125             32×(25+125)    88×125              102×76                58×98    178×101-178         84×36+64×84          75×99+2×75    83×102-83×2          98×199            123×18-123×3+85×123    50×(34×4)×3           25×(24+16)           178×99+178   79×42+79+79×57         7300÷25÷4             8100÷4÷75   16800÷120          30100÷2100      32000÷400    21500÷125    49700÷700          1248÷24           3150÷15      4800÷25                 2356-(1356-721)    1235-(1780-1665)     75×27+19×25  31×870+13×310         4×(25×65+25×28) (300+6)x12              25x(4+8)        125x(35+8)      (13+24)x8                  84x101            504x25          78x102          25x204          99x64               99x16          638x99          999x99          99X13+13       25+199X25      32X16+14X32   78X4+78X3+78X3        125X32X8        25X32X125       88X125          72X125                     3600÷25÷4       8100÷4÷75        3000÷125÷8    1250÷25÷5    1200-624-76        2100-728-772      273-73-27     847-527-273       278+463+22+37    732+580+268   1034++102  425+14+186           214-(86+14)    787-(87-29)     365-(65+118)    455-(155+230)        576-285+85      825-657+57     690-177+77     755-287+87         871-299        157-99        363-199        968-599                        600-60÷15                 20X4÷20X4      736-35X20                 25X4÷25X4                         98-18X5+25                56X8÷56X8