0.8*50x>0.7*50(x+4) 0.8*50x=0.7*50(x+4) 0.8*50x
1个回答

0.8*50x>0.7*50(x+4)

40x>35(x+4)

40x>35x+140

5x>140

x>28

0.8*50x=0.7*50(x+4)

40x=35(x+4)

40x=35x+140

5x=140

x=28

0.8*50x