58×31-48×31的简便方法?
发布网友
发布时间:2022-10-18 22:14
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热心网友
时间:2024-12-04 23:18
用乘法分配律简算
58×31-48×31
=(58-48)×31
=10×31
=310
热心网友
时间:2024-12-04 23:19
整数简便运算
(1)101×99
=(100+1)×99
=100×99+99
=9999
(2)14×35
=7×2×35
=7×70
=490
(3)25×28
=25×4×7
=100×7
=700
(4)4×9×25
=4×25×9
=100×9
=900
(5)43×5×4
=43×20
=860
(6)15×12
=15×2×6
=30×6
=180
(7)12×(40-5)
=12×40-12×5
=480-60
=420
(8)74×9-14×9
=(74-14)×9
=60×9
=540
(9)35×98
=35×(100-2)
=35×100-35×2
=3500-70
=3430
(10)23×134-34×23
=23×(134-34)
=23×100
=2300
热心网友
时间:2024-12-04 23:19
=31×(58-48)
=31×10
=310
热心网友
时间:2024-12-04 23:20
58×31-48×31
=(58-48)X31
=10×31
=310