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)(2)(7)(8)按照從左到右順序計(jì)算解答,
(3)(9)(12)按照先算括號(hào)里面的,再算括號(hào)外面的順序計(jì)算解答,
(4)(5)(6)(10)(11)按照先算第二級(jí)運(yùn)算,再算第一級(jí)運(yùn)算順序計(jì)算解答.
解答:
解:(1)1256+589-472
=1845-472
=1373;
(2)256-58+988
=198+988
=1186;
(3)1256-(58+988)
=1256-1046
=210;
(4)244+7×8
=244+56
=300;
(5)3+2×8
=3+16
=19;
(6)3×2+8
=6+8
=14;
(7)175+825-455
=1000-455
=545;
(8)603-58+908
=545+908
=1453;
(9)2056-(508+889)
=2056-1397
=659;
(10)0+7×8
=0+56
=56;
(11)999+8÷8
=999+1
=1000;
(12)8÷(8-2)
=8÷6
=1
.
點(diǎn)評(píng):本題主要考查學(xué)生依據(jù)四則運(yùn)算計(jì)算方法正確進(jìn)行計(jì)算的能力.