Phạm Việt Hòa
Giới thiệu về bản thân
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2023-01-18 16:54:45
`A``=``2^0``+`2^1``+``2^2``+`2^3``+`...`+``2^(2010)`
`2A=2^1+2^2+2^3+2^4+...+2^(2011)`
`2A-A=(2^1+2^2+2^3+2^4+...+2^(2011))-(2^0+2^1+2^2+2^3+...+2^(2010)`
`A=2^(2011)-1`
`A=B`
2023-01-09 14:46:20
11.(17-5)-17.(11-5)
=11.17-11.5-17.11-(-17).5
=(11.17-17.11)-(11.5+17.5)
=0-5(11+17)
=0-5.28
=0-140
=-140