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1、简便运算练习 12.065.072.94 30.349.7610.34 33 25743441.7 1.250.8 17+7 1,41.0619.7220.28 73+ 8+2 11+7+3700145 18.62.50.4 13 295.68(5.394.32) 19.68(2.979.68) 7+() 5()1.25(80.5) 0.25(41.2) 1.25(2130.8) 0.74(71)24(-) (12+) 7 (7-) 9.3(4)0.921.410.928.59 - 1.311.61.61.3 11.618.49999+999+99+9 4821-9983.212.525 1.
2、2588 7.60.25 3.50.125 3.89.90.38 103-2-(138)125 37002185815 20(175)472531420525(4032)(57)80 49258141256162554259468741532234540735 2564525(64)(86)1251027.35.1 3.60.25 2.69.9 1.062.54 (1525)2 37002185815 1225 2825125(84)321446856 284714425160(15500) 43519998(1259) 46185418 (40016)5 1704804 1035613681
3、332(24)15 5(206) 823827 96499914 75997510236 498080430216184 679339(138)125 20(175) 14205 2763827662 1022625(4032) (57)80 8141256 162554 251342843598 4825125 259468741532362512151235311282831(25250)4 (125125)8(712 - 15 )60 47 613 +37 6132538 8227 (152728 )215710 101- 71089 89 89 8935 99 + 35( 47 + 89 )2251521 34 + 1021 34 - 34 345 25363435 /