计算,G:C/g7i:Z
(1988+1986+1984+…+6+4+2)-(1+3+5+…+1983+1985+1987),G:C/g7i:Z
算式:提示8V0f7P,w6j'R,G:C/g7i:Z
=4M.O0^'Q6z-L,G:C/g7i:Z