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四年级小数点加减法计算题(60道小数加法和60道小数减法(列竖式))
2022-09-16 03:26新闻
简介 (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...
(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)64×9-14×9
=(64-14)×9
=50×9
=450
(9)35×98
=35×(100-2)
=35×100-35×2
=3500-70
=3430
(10)23×134-34×23
=23×(134-34)
=23×100
=2300
(11)957+(128-157)
=957-157+128
=800+128
=928
(12)706-399
=706-400+1
=307
