解:(1)(70-125÷25)×6,
=(70-5)×6,
=70×6-5×6,
=420-30,
=390;
(2)(443-430)×(405÷27),
=13×15,
=195;
(3)(480-24×5)÷45,
=(480-120)÷45,
=360÷45,
=8;
(4)101×67,
=(100+1)×67,
=100×67+1×67,
=6700+67,
=6767;
(5)25×4×9,
=100×9,
=900;
(6)1479+1447+1553,
=1479+(1447+1553),
=1479+3000,
=4479;
(7)17×63-23×17,
=17×(63-23),
=17×40,
=680;
(8)274-26-74,
=274-(26+74),
=274-100,
=174.
分析:(1)先算小括號里面的除法,再運用乘法分配律簡算;
(2)同時運算兩個小括號里面的減法和除法,再算括號外的乘法;
(3)先算小括號里面的乘法,再算小括號里面的減法,最后算括號外的除法;
(4)先把101分解成100+1,再運用乘法分配律簡算;
(5)按照從左到右的順序計算;
(6)運用加法結(jié)合律簡算;
(7)運用乘法分配律簡算;
(8)根據(jù)減法的性質(zhì)簡算.
點評:本題考查了四則混合運算,注意運算順序和運算法則,靈活運用所學(xué)的運算定律進行簡便計算.