初一有理数运算

有理数混合运算有理数混合运算【学法指要】例1.计算：()()666199819971999)4(7222352357323574)3(48242387651211)2(811432)50(313751)1(−−−−−−−−−+−−−−(1)原式118411501310712−=(2)原式＝－44＋40－42＋46＝－（44＋42）＋（40＋46）＝－86＋86＝0(3)原式−++=2357227374(4)原式＝)666(199812000−+−321331999311332000)666(19981)666()2000(=−=−+−−=例例2.2.计算计算：+−−−−+−+−−−+−−2051231211169449326250852642325314233.))((.||)()()(揭示思路:(1)原式＝()2)2(|24|)8(32527−+−−−+−−＝135＋(－4)－24＋4＝(135－24)＋(－4＋4)＝110＋0＝111(2)原式＝+−−5151161116949481