三升四年级数学 简便计算练习题

三升四年级数学 简便计算练习题


简介:
(1)723-251+177 =(723+177)-251 =900-251 =649 (2)872+284-272 =872-272+284 =600+284 =884 (3)537-142-58 =537-(142+58) =537-200 =337 (4)321+(279-155) =321+279-155 =600-155 =445 (5)372-(54+72) =372-72-54 =300-54 =246 (6)432-(154-68) =432+68-154 =500-154 =346 (7)1472-86-114 =1472-(86+114) =1472-200 =1272 (8)38+129+71 =38+(129+71) =38+200 =238