解:(1)125×8.8,
=125×8×1.1,
=1000×1.1,
=1100;
(2)1.3+4.25+3.7+3.75,
=(1.3+3.7)+(4.25+3.75),
=5+8,
=13;
(3)4.8×1.01,
=4.8×1+4.8×0.01,
=4.8+0.048,
=4.848;
(4)17.16-(3.5-2.85),
=17.16+2.85-3.5,
=20.01-3.5,
=16.51;
(5)3.4×99+3.4,
=3.4×(99+1),
=3.4×100,
=340;
(6)
,
=(
)×17,
=1×17,
=17;
(7)
,
=
,
=28
,
=28
;
(8)
,
=(
)×
,
=1×
,
=
;
(9)64.2×87+64.2×13.
=64.2×(87+13),
=64.2×100,
=6420.
分析:根據(jù)減法是運(yùn)算性質(zhì)、加法和乘法的運(yùn)算定律進(jìn)行簡(jiǎn)算.
點(diǎn)評(píng):此題考查的目的是理解掌握減法的運(yùn)算性質(zhì)、加法、乘法的運(yùn)算定律,并且能夠靈活運(yùn)用這些運(yùn)算性質(zhì)和運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.