问题
解答题
|
答案
①376+199,
=376+200-1,
=575;
②575-298,
=575-300+2,
=277;
③25×36,
=25×4×9,
=100×9,
=900;
④21×8×5,
=21×(8×5),
=21×40,
=840;
⑤25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000.
|
①376+199,
=376+200-1,
=575;
②575-298,
=575-300+2,
=277;
③25×36,
=25×4×9,
=100×9,
=900;
④21×8×5,
=21×(8×5),
=21×40,
=840;
⑤25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000.