问题
解答题
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答案
(1)256×7-56×7,
=(256-56)×7,
=200×7,
=1400;
(2)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(3)22×35,
=(20+2)×35,
=20×35+2×35,
=700+70,
=770;
(4)99×99+99,
=99×(99+1),
=99×100,
=9900.
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(1)256×7-56×7,
=(256-56)×7,
=200×7,
=1400;
(2)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(3)22×35,
=(20+2)×35,
=20×35+2×35,
=700+70,
=770;
(4)99×99+99,
=99×(99+1),
=99×100,
=9900.