脱式计算,能简算的要简算.
0.48×8.5-3.5
100.1×7.41.45×1.02-1.45×0.0224.5×0.8×1.24444×0.254.78×9.9+0.478.
脱式计算,能简算的要简算.0.48×8.5-3.5100.1×7.41.45×1.02-1.45×0.0224.5×0.8×1.24444×0.254.78×9.9+
答案:2 悬赏:20 手机版
解决时间 2021-03-27 22:41
- 提问者网友:王者佥
- 2021-03-27 13:09
最佳答案
- 五星知识达人网友:蕴藏春秋
- 2020-03-14 07:33
解:(1)0.48×8.5-3.5,
=4.08-3.5,
=0.58;
(2)100.1×7.4,
=(100+0.1)×7.4,
=100×7.4+0.1×7.4,
=740+0.74,
=740.74;
(3)1.45×1.02-1.45×0.02,
=1.45×(1.02-0.02),
=1.45×1,
=1.45;
(4)24.5×0.8×1.24,
=19.6×1.24,
=24.304;
(5)444×0.25,
=111×4×0.25,
=111×(4×0.25),
=111×1,
=111;
(6)4.78×9.9+0.478,
=4.78×9.9+4.78×0.1,
=4.78×(9.9+0.1),
=4.78×10,
=47.8.解析分析:(1)先算乘法,再算减法;
(2)先把100.1分解成(100+0.1)再运用乘法分配律简算;
(3)运用乘法分配律简算;
(4)按照从左到右的顺序计算;
(5)先把444分解成111×4,再运用乘法结合律简算;
(6)先把0.478分解成4.78×0.1,再运用乘法分配律简算.点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=4.08-3.5,
=0.58;
(2)100.1×7.4,
=(100+0.1)×7.4,
=100×7.4+0.1×7.4,
=740+0.74,
=740.74;
(3)1.45×1.02-1.45×0.02,
=1.45×(1.02-0.02),
=1.45×1,
=1.45;
(4)24.5×0.8×1.24,
=19.6×1.24,
=24.304;
(5)444×0.25,
=111×4×0.25,
=111×(4×0.25),
=111×1,
=111;
(6)4.78×9.9+0.478,
=4.78×9.9+4.78×0.1,
=4.78×(9.9+0.1),
=4.78×10,
=47.8.解析分析:(1)先算乘法,再算减法;
(2)先把100.1分解成(100+0.1)再运用乘法分配律简算;
(3)运用乘法分配律简算;
(4)按照从左到右的顺序计算;
(5)先把444分解成111×4,再运用乘法结合律简算;
(6)先把0.478分解成4.78×0.1,再运用乘法分配律简算.点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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- 1楼网友:老鼠爱大米
- 2021-03-19 17:51
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