考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)按照先同時(shí)計(jì)算乘法和乘法,再算加法順序計(jì)算解答,
(2)運(yùn)用加法交換律和結(jié)合律,以及減法性質(zhì)解答,
(3)運(yùn)用乘法分配律解答,
(4)按照先算括號(hào)里面的除法,再算括號(hào)里面的加法,最后算括號(hào)外面的減法順序計(jì)算解答.
解答:
解:(1)5.1÷0.17+2.6×6
=30+15.6
=45.6;
(2)54.2-
+4.8-
=(54.2+4.8)-(
+
)
=59-2
=57;
(3)0.6×0.25+0.18÷4+0.12×25%
=(0.6+0.18+0.12)×0.25
=0.9×0.25
=0.225;
(4)0.9-(0.15+0.35÷
)
=0.9-(0.15+0.49)
=0.9-0.64
=0.26.
點(diǎn)評(píng):(1)依據(jù)四則運(yùn)算計(jì)算方法正確進(jìn)行計(jì)算,(2)正確運(yùn)用簡(jiǎn)便方法解決問題,是本題考查知識(shí)點(diǎn).