考點(diǎn):整數(shù)四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)運(yùn)用加法交換律簡(jiǎn)算;
(2)根據(jù)減法的性質(zhì)簡(jiǎn)算;
(3)運(yùn)用湊整法簡(jiǎn)算;
(4)根據(jù)加法交換律和結(jié)合律簡(jiǎn)算;
(5)運(yùn)用湊整法簡(jiǎn)算;
(6)根據(jù)加法結(jié)合律簡(jiǎn)算.
解答:
解:(1)368-273+32
=368+32-273
=400-273
=127;
(2)290-122-78
=290-(122+78)
=290-200
=90;
(3)563+199
=563+200-1
=763-1
=762;
(4)351+(88+49)
=351+49+88
=400+88
=488;
(5)432-397
=432-400+3
=32+3
=35;
(6)192+265+135
=192+(265+135)
=192+400
=592.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.