解:(1)200÷2÷5,
=200÷(2×5),
=200÷10,
=20;
(2)9×(25+55),
=9×80,
=720;
(3)72÷8×6,
=9×6,
=54;
(4)6×19×5,
=6×5×19,
=30×19,
=570;
(5)949-260×3,
=949-780,
=169;
(6)2000-106×4,
=2000-424,
=1576;
(7)(31+77)×9,
=108×9,
=972;
(8)(206+103)÷3,
=309÷3,
=103;
(9)80-75÷5,
=80-15,
=65;
(10)90+84÷4,
=90+21,
=111;
(11)15×2×5,
=15×(2×5),
=15×10,
=150.
分析:(1)根據(jù)除法的性質(zhì)簡算;
(2)先算小括號(hào)里面的加法,再算括號(hào)外的乘法;
(3)先算除法,再算乘法;
(4)運(yùn)用乘法交換律簡算;
(5)先算乘法,再算減法;
(6)先算乘法,再算減法;
(7)先算小括號(hào)里面的加法,再算括號(hào)外的乘法;
(8)先算小括號(hào)里面的加法,再算括號(hào)外的除法;
(9)先算除法,再乘減法;
(10)先算除法,再算加法;
(11)運(yùn)用乘法結(jié)合律簡算.
點(diǎn)評(píng):本題考查了簡單的四則混合運(yùn)算,關(guān)鍵是理清楚運(yùn)算的順序,然后根據(jù)運(yùn)算順序逐步求解即可.