(m-1) (m5 + m4 + m3 + m2 + m +1)=_____-1;
为 m^6
(____)(mn-1+ mn-2+ … … … m2 + m +1)=_________;
为(m-1) m^n-1
2 +22 +23 + + 298 +299
你这个是不是2+2^2+2^3+...+2^98+2^99
=(2^100-1)/(2-1)=2^100-1
对于整数a、b,有a※b= a+b-1 ,a#b= ab-1
4#[(6※8)※(3#5)]
=4#[(6+8-1)※(3*5-1)]
=4#[13※14]
=4#(13+14-1)
=4#26
=4*26-1
=4*25+4-1
=103