问题 解答题
(1)74×53+47×74(2)2169-642-358(3)948+1061+52+939(4)125×64.
答案

(1)74×53+47×74,

=74×(53+47),

=74×100,

=7400;

(2)2169-642-358,

=2169-(642+358),

=2169-1000,

=1169;

(3)948+1061+52+939,

=(948+52)+(1061+939),

=1000+2000,

=3000;

(4)125×64,

=125×8×8,

=(125×8)×8,

=1000×8,

=8000.

选择题
判断题