列式计算。-J'd3x/v+^0h+P
(1)2000与4000的和事多少?-J'd3x/v+^0h+P
3r*~3t6?)X8b6_.X9Y,i-z-J'd3x/v+^0h+P
(2)从8300里剪去300,还剩多少?-J'd3x/v+^0h+P
,d2`5{,r.Z:d.}3z6N2Q0V1S*v:B2d-J'd3x/v+^0h+P