sorry 看错了x/0.98+(7650-x)/1.1=7650/1.02x/0.98+(7650-x)/1.1=75001.1x+0.98(7650-x)=80851.1x+7497-0.98x=8085'把上一步0.98(7650-x)去括号得到的0.12x=588x=4900
