解题思路:(1)(2)根据加法的结合律计算即可;
(3)根据乘法的结合律计算即可;
(4)(6)(8)根据乘法的交换律和结合律计算即可;
(5)根据加法的交换律和结合律计算即可;
(7)根据加法的交换律和结合律以及连减的简算计算即可;
(10)先凑整再计算即可.
(1)169+226+274,
=169+(226+274),
=169+500,
=669;
(2)(923+174)+26,
=923+(174+26),
=923+200,
=1123;
(3)(75×25)×4,
=75×(25×4),
=75×100,
=7500;
(4)2×34×50,
=2×50×34,
=100×34,
=3400;
(5)357+432+368+153,
=(357+153)+(432+368),
=510+800,
=1310;
(6)13×125×7×8,
=(13×7)×(125×8),
=91×1000,
=91000;
(7)385-173+615-227,
=(385+615)-(173+227),
=1000-400,
=600;
(8)16×(125×6),
=(8×2)×(125×6),
=(8×125)×(2×6),
=1000×12,
=12000;
(9)9+98+997+9996+99995+999994+21,
=(9+1)+(98+2)+(997+3)+(9996+4)+(99995+5)+(999994+6),
=10+100+1000+10000+100000+1000000,
=1111110.
点评:
本题考点: 四则混合运算中的巧算;整数四则混合运算.
考点点评: 考查了四则混合运算中的巧算,解题的关键是灵活运用运算律简便计算.