四年级数学上册简便计算题各种题型每日20道(全)-四年级简算20道
158+262+138 375+219+381+225 5001-247-1021-232 〔181+2564〕+2719 378+44+114+242+222276+228+353+219 (375
276+228+353+219 158+262+138 2214+638+286 497-299 (375+1034)+(966+125) 375+219+381+225 3065-738-1065 2370+1995 (2130+783+270)+1017 5001-247-1021-232 899+344 3999+498 99+999+9999+99999 〔181+2564〕+2719 2357-183-317-357 1883-398 7755-(2187+755) 378+44+114+242+222 2365-1086-214 . 实用文档

