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1、四年级下册简便运算四年级下册简便运算 100100 道道158+262+138375+219+381+22550012471021232(181+2564)+2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+999997755(2187+755)2214+638+28630657381065899+3442357183317357236510862144972992370+19953999+498188339812257524138254(13125)(38)(12+2
2、4+80)5070425253212532(25+125)881251027658981781011788436+64847599+2758310283298199123181233+8512350(344)325(24+16)17899+1787942+79+795773002548100475168001203010021003200040049700700124824315015480025215001252356(1356721)1235(17801665)7527+192 531870+133104(2565+2528)(1)(7861)39(2)7008218(3)34816324
3、2410537(4)125474725(5)201316(6)37420522695(7)3000999(8)997721(9)8747087053(10)(555555555)125(11)125(840)25(12)994999(13)264974264(14)454999999545(15)9999366666332(16)124386512476110767(17)624445518(18)3400623438203814(19)199219911991-199119901990(20(246100)-(13599)1 2.73 0.89 1.272 4.37 0.28 1.63 5.
4、721 10 0.432 2.5682 9.3 5.26 2.743 13.4(3.45.2)4 14.9(5.24.9)5 18.32 5.47 4.326 17.29 5.28 6.291 25 6.8 0.042 0.25 32 0.1253 6.4 1.25 12.51 0.45 2012 0.58 10.13 50.2 994 4.7 9.95 3.28 5.7 6.72 5.76 2.1 99 2.17 1.7 9.9 0.178 23 0.1 2.3 9.91 0.18 4.26 0.18 4.262 0.58 1.3 0.58 1.33 7.3 4 2.7 0.254 3.75 0.5 2.75 25 5.26 0.125 2.74 8a b c=a (b c)6 6.3 1.87 4.2 3.58.9.5(1.9 8)9 12.8 (0.4 1.6)10 930 0.6 511 63.4 2.5 0.412(7.7 1.54)0.713(11.7 9.9)0.9