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1、. . 小学数学四则运算简便运算大汇总 简便运算 4 3 1 +3.2 5 3 2 +6.8 25 (8 0.4) 1.25 7 15 4 (2 15 4 23 1 ) ( 12 11 18 7 + 24 5 ) 72 93.53 2 1 7 2 1125997 998+1246+9989 (870087087) 87 1258.8 1.34.25 3.7 3.75 17.15( 3.5 2.85 ) 3.4 99 3.4 4.81.01 0.4( 2.5 73) ( 1.6 1.6 1.6 1.6 ) 25 ( 9 4 6 5 18 7 ) 36 1 7 1 100 25 7 12.3 2.
2、45 5.7 4.55 9 7 2 5 1 11 5 9 2 0.1250.25 64 . . 64.2 870.642 1300 78367.8 7417 5 4 21 13 17 12 17 8 8 7 2 1 0.125 2 1 0.5 2.42 4 3 +4.58 3 1 1 43 25100 26 25 4.25 3 6 5 (2 6 1 1 4 3 ) 3.83.9 3.9 0.1 0.1 3.9 12.1( 15 1 + 21 1 ) 105 )37.125.8(63.975.4)38.648.2(17.348.7 5 1 1) 9 5 18 .3( 9 5 7 4 1 6666
3、179079 2 1 333387 7.21111. 07. 09999.03 .672.109. 136 8 .562 .108.148 5 2 69 .37 5 2 25 5 3 3 2. 33.198.168. 65.186.678 .515.818.155 .81 . . 3 .541352.422351 .122354123341223411234 8124668124468122468112468 3 4 - ( 1 5 + 1 3 ) 9 8 2 5 3 4 - 1 2 4 5 8 1( 3 4 + 1 3 ) 1 6 - ( 5 14 - 1 3 ) 7 9 5 7 + 9 8
4、 5 9 + 3 8 1 - 5 8 25 28 - 3 10 1 4 3 7 + 4 7 4 5 -( 6 7 3 14 + 6 13 ) 4 3 5 2 5 2 12 6 1 4 1 2 1 15 14 17 8 17 14 15 9 10 7 13 1 5 1 3 2 1 . . 42 5 -(2.5+1.9) (0.5-0.5) 42 5 -2.5+1.9(0.5-0.5) 42 5 -2.5+1.90.5-0.5 42 5 -(2.5+1.90.5)-0.5 42 5 -(2.5+1.9) (0.5-0.5) 4 2 5 -(2.5+1.9) 0.5-0.5 121 3 -41 2
5、-21 4 -51 8 -12.5% 0.125 3 4 + 1 8 8.25+12.5% (7 8 +13 16 ) 13 16 2.5 3 7 0.4 21 3 15 3 14 -2.25-73 4 8 9 15 16 +( 7 16 -1 4 ) 1 2 10 ( 4 5 -0.5) 3 7 (2.7-4.25 2 5 ) 2.8 4 7 1.25+11 4 7.4+125%5 8 10-4.68 7.2+0.05 15 7 (5 5 6 -5 6 5) 18.09 (1.5+22 3 ) 3.75-2 3 0.84 0.3 (1.96 18.9) 5 6 -(0.15+ 9 20 )
6、1.8 1325+540 18 15 . . 2.5 8+9.5 1 8 +4 0.125 2.1+7 (3 1 12 -1.625) 12 3 2.5 2 5 -2.1 1 3 +9.63 (71 3 +71 3 2+71 3 ) 4 3.8+1 3 14 +6.2+32 7 2 7 (4 1 3 -3.5) 5 8 (23 4 +2 3 -15 6 ) 12 2.5 8+3.5 1 8 +0.125 (9.5+91 2 +91 2 +9.5) 121 2 31 3 -(15 7 +1 8 13 4 ) 12 5 (0.05+ 1 4 ) 0.25- 2 5 125% 382+498 381
7、 382 498-116 5.35 0.25+2.65 1 4 (31 3 +3 4 -25 8 ) (11 5 80%) (4.2 0.7+6 1 25 ) 5 26 0.832.512.5 7.6 9.9 0.01 8.320.58-0.32 0.58 1.255+0.2520 10.69-2.5 2.4 0.3 2.50.04 . . 8.4 57+8.442+8.4 130.652 7.2 10.1-7.2 1.2 2.5+2.8 2.5 320.653.23.5 9 8 16 5 15 25(4+ 25 4 ) 60( 12 5 + 15 4 - 2 1 ) 4 15 0.35+0.
8、65 15 4 0.2537.5%+8 5 4 1 25% 31 17 + 31 14 25% 11 2 9 121 72 19 4 15 0.350.65 15 4 5 2 4 5 2 3 21 + 3 1 6 5 5 8 5 - 8 5 5 2 13 6 26 9 3 2 125 8 1000 125 8 . . ( 5 1 3 1 )15 5 3 9 1 5 2 9 32 5 4 8 5 7 5 6 5 7 2 6 1 15 1 ( 3 1 12 1 ) 4 1 (3 13 5 13 8 ) 6 5 9 2 40 3 ( 4 1 + 7 5 ) 28 5 3 4 3 + 5 3 4 1
9、3 15 8 5 4 8 7 15 4 30 21 6 7 11 1 + 6 5 11 ( 4 3 8 1 )12 5 13 3 26 9 33 4 12 11 36 5 . . 9 8 35 34 8 9 ( 8 1 16 5 )12 7 7 23 7 26 46)3 8 5 2( 6 5 ) 3 1 2 3 2 1() 4 3 4 11 ( 8 1 8 7 5 6 5 16.516. 5 6 1 4 8 1 85 ) 4 9 2 15 ( 4 9 2 15 ) 7 4 7 4 1() 4 3 747. 0( 33 97 ) 15 8 6 5 9 7 (9035. 4 5 3 8 5 2 1
10、35.4 ( 4 1 3 1 )-( 5 1 4 1 )- ( 6 1 5 1 )( 13 6 4 9 4 3)- ( 9 5 6 13 7 1) 12.065.07 2.94 30.349.7610.34 8 3 3 8 3 3 2574 3441.7 1.25 3 2 0.8 17 7 3 + 17 4 7 7 3 1 9 5 13 7 9 5 , 41.0619.72 20.28 7 5 2 3 8 3 + 8 3 8 7 4 +2 9 5 9 5 11 3 2 +7 5 2 +3 5 3 70014518.62.50.4 13 19 17 19 17 29 27 13 27 13 .
11、. 5.68( 5.394.32)19.68( 2.979.68)7 17 2 +( 18 5 17 2 ) 5 7 6 ( 8 3 7 1 ) 1.25( 80.5)0.25( 41.2)1.25( 2130.8)0.74 (71 100 74 ) 24 ( 12 11 - 8 3 - 6 1 - 3 1 ) (12+ 7 2 ) 7 (7 5 3 - 20 19 ) 38 5 9.3 (4 93 100 ) 0.921.410.928.59 5 16 13 7 - 5 3 13 7 1.311.61.61.3 5 9 11.618.4 5 9 9999+999+99+9 4821-9983.2 12.5 25 1.25 88 7.6 0.25 3.5 0.125 3.8 9.90.38 25 7 103- 25 7 2- 25 7 (138)125 37002185815 20 (175) 4 7253 . . 14205 25(4032)(57) 80 4925 8141256 162554 259468741532 2345 40735 25645 25(64) (86)125 1027.35.1 3.60.252.6 9.9 1.062.54