60x+70(100-x)=63*100
60x+7000-70x=6300
60x-70x=6300-7000
-10x= -700
x= -700÷(-10)
x=70
有不明白的可以追问!谢谢!!
祝学习进步
60x+70(100-x)=63*100
解60x+7000-70x=6300
60x-70x=6300-7000
-x=-70
x=70
谢谢采纳
60x+70(100-x)=63*100
60x+7000-70x=6300
60x-70x=6300-7000
-10x=-700
10x=700
x=70
60x+70(100-x)=63*100
60x+7000-70x =6300
6x+700-7x =630
6x -7x =630-700
-x =-70
x =70
60x+70(100-x)=63*100
60x+7000-70x=6300
-10x+7000=6300
-10x=6300-7000
-10x=-700
x=-700/-10
x=70