文档介绍:用简便方法计算25××4                     5×××15×2                      36××   45×102                              45×  34×27+34×73                        34×+34×  86×99+86                             ×99+   125×88                               × +++++(-)++---(+)+-+-+---++++---+-+-+----++++-+--××4(-)×××+×--×--××+78×+-××+×-×-(-)÷÷÷×+÷÷-+-÷÷÷×99+÷(×4)÷×××÷÷×-(23+)×+××××99+×-×÷÷×××(-)÷8÷×+×÷÷÷÷×+×××(-)+××+×-÷÷×+×(-)---×11-×16+×23+-(-)×-××57+23××-÷×+××-××-××++++++++++++++++++++---+++--+-+---×++++-+×-(+)--×××+×××××+×××-××(×)+××101-×-××××