解:(1)125×88,
=125×(8×11),
=125×8×11,
=1000×11,
=11000;
(2)2011×99+2011,
=2011×(99+1),
=2011×100,
=201100;
(3)4.9-7.5+15.1-2.5,
=(4.9+15.1)-(7.5+2.5),
=20-10,
=10;
(4)160+880÷20×4,
=160+44×4,
=160+176,
=336;
(5)160+880÷(20×4),
=160+880÷80,
=160+11,
=171;
(6)(160+880)÷20×4,
=1040÷20×4,
=52×4,
=208.
分析:(1)把88分解成8×11,再運(yùn)用乘法結(jié)合律簡算;
(2)運(yùn)用乘法分配律簡算;
(3)根據(jù)加法結(jié)合律和減法的性質(zhì)簡算;
(4)先算除法,再算乘法,最后算加法;
(5)先算小括號里面的乘法,再算括號外的除法,最后算加法;
(6)先算小括號里面的加法,再算括號外的除法,最后算乘法.
點(diǎn)評:本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡便計(jì)算;注意后三題小括號改變了運(yùn)算順序.