题目内容
| (1)74×53+47×74 | (2)2169-642-358 | (3)948+1061+52+939 | (4)125×64. |
(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.
=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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