99×101335+270+130+265625-180-225
35×99+35175×55+25×5550×25×20×40.

解:(1)99×101,
=99×(100+1),
=99×100+99,
=9900+99,
=9999;

(2)335+270+130+265,
=(335+265)+(270+130),
=600+400,
=1000;

(3)625-180-225,
=(625-225)-180,
=400-180,
=220;

(4)35×99+35,
=35×(99+1),
=35×100,
=3500;

(5)175×55+25×55,
=(175+25)×55,
=200×55,
=200×(50+5),
=1000+100,
=1100;

(6)50×25×20×40,
=(50×20)×(25×40),
=1000×1000,
=1000000.
分析:(1)把101看做100+1,運用乘法分配律簡算;
(2)(3)運用加法交換律與結(jié)合律簡算;
(4)(5)運用乘法分配律簡算;
(6)運用乘法交換律與結(jié)合律簡算.
點評:完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.
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