解:(1)450÷18+375,
=25+375,
=400;
(2)3.68-0.82-0.18,
=3.68-(0.82+0.18),
=3.68-1,
=2.68;
(3)36×(
+
),
=36×
+36×
,
=8+21,
=29;
(4)
×24-6×
,
=
×(24-6),
=
×18,
=16;
(5)
-(
+
),
=
-
-
,
=
-
-
,
=1-
,
=
;
(6)8.24-8.24÷4,
=8.24-2.06,
=6.18;
(7)19÷[(
+
)÷
],
=19÷[
÷
],
=19÷
,
=10;
(8)
×
÷
+
,
=
×
×
+
,
=
×
+
,
=
+
,
=
;
(9)
×71+19÷
,
=
×71+19×
,
=
×(71+19),
=
×90,
=63.
分析:(1)先算除法,再算加法;
(2)(5)根據(jù)減法的性質(zhì)簡算;
(3)(4)運(yùn)用乘法分配律簡算;
(6)先算除法,再算減法;
(7)先算小括號(hào)里面的加法,再算中括號(hào)里面的除法,最后算括號(hào)外的除法;
(8)先把除法變成乘法,再運(yùn)用乘法交換律簡算,最后算加法;
(9)先把除法變成乘法,再運(yùn)用乘法分配律簡算.
點(diǎn)評(píng):此題是考查四則混合運(yùn)算,要仔細(xì)觀察算式的特點(diǎn),靈活運(yùn)用一些定律進(jìn)行簡便計(jì)算.