解:(1)3318+312÷24×205,
=3318+13×205,
=3318+2665,
=5983;
(2)47.1×9.4-47.1÷2-47.1,
=47.1×(9.4-0.5-1),
=47.1×7.9,
=372.09;
(3)[(1-0.5)×20]÷[(1+0.25)÷4],
=10÷0.3125,
=32;
(4)
,
=(
)
,
=
,
=
;
(5)100-99+98-97+96-…+4-3+2-1,
=(100-99)+(98-97)+(96-95)+…+(4-3)+(2-1),
=1×50,
=50;
(6)
,
=
,
=
,
=
.
分析:(1)題應(yīng)注意運(yùn)算順序,先算除法和乘法,再算加法;
(2)題利用乘法分配律的逆運(yùn)算進(jìn)行簡(jiǎn)算;
(3)題先算小括號(hào)再算中括號(hào);
(4)題利用加法交換律計(jì)算;
(5)題有一定規(guī)律,一共有50個(gè)1相加;
(6)題通過(guò)把分?jǐn)?shù)寫成兩個(gè)分?jǐn)?shù)相減的形式,通過(guò)抵消很快得出答案.
點(diǎn)評(píng):此題考查了整數(shù)、小數(shù)、分?jǐn)?shù)的四則運(yùn)算,以及靈活運(yùn)用所學(xué)知識(shí)進(jìn)行巧算的能力.