5×99+5= 47×78-376= 56×101= 37×27= 81×37-7×81= 75×99+75= (25+50)×40=

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/02 14:07:09
5×99+5= 47×78-376= 56×101= 37×27= 81×37-7×81= 75×99+75= (25+50)×40=

5×99+5= 47×78-376= 56×101= 37×27= 81×37-7×81= 75×99+75= (25+50)×40=
5×99+5= 47×78-376= 56×101= 37×27= 81×37-7×81= 75×99+75= (25+50)×40=

5×99+5= 47×78-376= 56×101= 37×27= 81×37-7×81= 75×99+75= (25+50)×40=
5×99+5= 5×(99+1) = 5×100 = 500
47×78-376 = 47×(78-8) = 47×70 = 3290
56×101= 56×(100+1) = 5600 + 56 = 5656
37×27= (32+5)×(32-5) = 32² - 5² = 1024 - 25 = 999
81×37-7×81= 81×(37-7) = 81×30 = 2430
75×99+75= 75×(99+1) = 75×100 = 7500
(25+50)×40= (1+2)×25×40 = 3×1000 = 3000

500
3290
5656
2430
7500
3000