试题:
(1)74×53+47×74 (2)2169-642-358 (3)948+1061+52+939 (4)125×64.

答案:

我来补答
(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.
 
 
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剩余:2000
这些题目你会做吗?