简便运算.
1874-298=762+99=789-101=28×25=125×32=810÷45=72×8×5=480÷6÷8=
简便运算.1874-298=762+99=789-101=28×25=125×32=810÷45=72×8×5=480÷6÷8=
答案:2 悬赏:40 手机版
解决时间 2021-03-22 05:09
- 提问者网友:抽煙菂渘情少年
- 2021-03-21 07:51
最佳答案
- 五星知识达人网友:往事埋风中
- 2021-03-21 08:30
解:(1)1874-298,
=1874-300+2,
=1574+2,
=1576;
(2)762+99,
=762+100-1,
=862-1,
=861;
(3)789-101,
=789-100-1,
=689-1,
=688;
(4)28×25,
=7×4×25,
=7×(4×25),
=7×100,
=700;
(5)125×32,
=125×(8×4),
=125×8×4,
=1000×4,
=4000;
(6)810÷45,
=(810÷9)÷(45÷9),
=90÷5,
=18;
(7)72×8×5,
=72×(8×5),
=72×40,
=2880;
(8)480÷6÷8,
=480÷(6×8),
=480÷48,
=10.解析分析:(1)(2)(3)运用凑整法简算;
(4)先把28分解7×4,再运用乘法结合律简算;
(5)先把32分解成8×4,再运用乘法结合律简算;
(6)运用商不变规律简算;
(7)运用乘法结合律简算;
(8)根据连续除以两个数,等于除以这两个数的积简算.点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
=1874-300+2,
=1574+2,
=1576;
(2)762+99,
=762+100-1,
=862-1,
=861;
(3)789-101,
=789-100-1,
=689-1,
=688;
(4)28×25,
=7×4×25,
=7×(4×25),
=7×100,
=700;
(5)125×32,
=125×(8×4),
=125×8×4,
=1000×4,
=4000;
(6)810÷45,
=(810÷9)÷(45÷9),
=90÷5,
=18;
(7)72×8×5,
=72×(8×5),
=72×40,
=2880;
(8)480÷6÷8,
=480÷(6×8),
=480÷48,
=10.解析分析:(1)(2)(3)运用凑整法简算;
(4)先把28分解7×4,再运用乘法结合律简算;
(5)先把32分解成8×4,再运用乘法结合律简算;
(6)运用商不变规律简算;
(7)运用乘法结合律简算;
(8)根据连续除以两个数,等于除以这两个数的积简算.点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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- 1楼网友:独钓一江月
- 2021-03-21 08:52
我也是这个答案
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