问题
解答题
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答案
(1)(250+25)×4
=250×4+25×4
=1000+100,
=1100;
(2)42×42+42×58,
=42×(42+58),
=42×100,
=4200;
(3)99×57,
=(100-1)×57,
=100×57-57×1,
=5700-57,
=5643;
(4)125×32,
=125×8×4,
=1000×4,
=4000.
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(1)(250+25)×4
=250×4+25×4
=1000+100,
=1100;
(2)42×42+42×58,
=42×(42+58),
=42×100,
=4200;
(3)99×57,
=(100-1)×57,
=100×57-57×1,
=5700-57,
=5643;
(4)125×32,
=125×8×4,
=1000×4,
=4000.