题目内容
| 简便运算要注意,写出简算过程,否则不会得分的. 376+199 | 575-298 | 25×36 | 21×8×5 | 25×32×125. |
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.
=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.
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