2X+98Y=98X+Y=100,那么X+Y=?
3个回答

2x+98y=100①

98x+y=100②

①×49:98x+4802y=4900③

③-②:4801y=4800

y=4800/4801

②×98:9604x+98y=9800④

④-①:9602x=9700

x=4805/4801

x+y=4805/4801+4800/4801

=9605/4801