1/(X+2)+1/(X+5)=1/(X+3)+1/(X+4)江湖救急,方程求解!
问题描述:
1/(X+2)+1/(X+5)=1/(X+3)+1/(X+4)江湖救急,方程求解!
答
1/(X+2)+1/(X+5)=1/(X+3)+1/(X+4)移项
1/(X+2)-1/(X+3)=1/(X+4)-1/(X+5)
左右分别通分得(X+2)(X+3)=(X+4)(X+5)
展开后得4x=-14 所以x=-7/2