问题 解答题
用简便方法计算下面各题
125×7×825×(4×98)(675+321)+325
(31×5)×(2×7)125×4×8×25229+137+171+363.
答案

①125×7×8

=(125×8)×7

=1000×7

=7000;

②25×(4×98)

=(25×4)×98

=100×98

=9800;

③(675+321)+325

=(675+325)+321

=1000+321

=1321;

④(31×5)×(2×7)

=(31×7)×(5×2)

=217×10

=2170;

⑤125×4×8×25

=(125×8)×(4×25)

=1000×100

=100000;

⑥229+137+171+363

=(229+171)+(137+363)

=400+500

=900.

单项选择题
单项选择题