`e,(9-15)^2+10^3÷(-2)^3`
`=(-6)^2+5^3 . 2^3÷(-2)^3`
`=36+125.(-1)`
`=36+(-125)`
`=-89`
`f,A=2^100-2^99-2^98-...-2^2-2-1`
`=>2A=2^101-2^100-2^99-...-2^3-2^2-2`
`=>2A-A=2^101-2^100-2^99-...-2^3-2^2-2-2^100+2^99+2^98+...+2^2+2+1`
`=>A=2^101-2^100-2^100+1`
`=>A=2^101-2^101+1`
`=>A=0+1`
`=>A=1`