考點(diǎn):繁分?jǐn)?shù)的化簡(jiǎn),四則混合運(yùn)算中的巧算
專(zhuān)題:計(jì)算問(wèn)題(巧算速算)
分析:(1)變形為(8.37-1.37)-(3.25+2.25)再計(jì)算;
(2)將除法變?yōu)槌朔,再根?jù)乘法分配律計(jì)算;
(3)先計(jì)算除法,再算同分母加法,最后相加即可求解;
(4)先變形為3322×18+6678×18,再根據(jù)乘法分配律計(jì)算;
(5)將分母變形為2014+2012×2014-1,再根據(jù)乘法分配律計(jì)算,最后約分計(jì)算即可;
(6)先變形為(3800-38)÷38+(83000-83)÷83,再根據(jù)分配律計(jì)算.
解答:
解:(1)8.37-3.25-(1.37+2.25)
=(8.37-1.37)-(3.25+2.25)
=7-5.5
=1.5;
(2)3.375÷5
-
×
=3
×
-
×
=(3
-
)×
=3×
=
;
(3)9÷13+13÷9+11÷13+14÷9+6÷13
=
+
+
+
+
=(
+
+
)+(
+
)
=2+3
=5;
(4)9966×6+6678×18
=3322×18+6678×18
=(3322+6678)×18
=10000×18
=180000;
(5)
2013+2012×2014 |
2013×2014-1 |
=
2014+2012×2014-1 |
2013×2014-1 |
=
=1;
(6)3762÷38+82917÷83
=(3800-38)÷38+(83000-83)÷83
=100-1+1000-1
=1098.
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.