解:(1)168.1÷(4.3×2-0.4)
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
(2)101×26-52÷2
=101×26-26,
=(101-1)×26,
=100×26,
=2600;
(3)8-
×5-
=8-
-
,
=8-(
+
),
=8-1,
=7;
(4)2-
÷
÷75%
=2-
×
×
,
=2-1
,
=
;
(5)3.5÷[(
-
)×3]
=3.5÷[
×3],
=3.5÷0.5,
=7;
(6)(10.4×7+10.4×2-10.4)×
.
=(7+2-1)×10.4×
,
=8×
×10.4,
=31.2.
分析:(1)(4)(5)根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可:先算乘除,再算加減,有的括號的要先算括號里面的;
(2)(6)可根據(jù)乘法分配律計(jì)算;
(3)可根據(jù)一個(gè)數(shù)減兩個(gè)數(shù),等于減去這兩個(gè)數(shù)的和的減法性質(zhì)計(jì)算.
點(diǎn)評:完成本題要細(xì)心分析式中數(shù)據(jù)的特點(diǎn)及內(nèi)在聯(lián)系,然后運(yùn)用合適的方法計(jì)算.