0.8*50x>0.7*50(x+4) 0.8*50x=0.7*50(x+4) 0.8*50x(1)0.8*50x>0.7*50(_数学解答

0.8*50x>0.7*50(x+4) 0.8*50x=0.7*50(x+4) 0.8*50x
(1)0.8*50x>0.7*50(x+4)
(2)0.8*50x=0.7*50(x+4)
(3)0.8*50x

人气：326 ℃　时间：2020-04-17 14:43:34

解答

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