80x+60(1000-x)=69800,求解,要过程

2025-05-14 07:44:52
推荐回答(2个)
回答1:

解:80x+60(1000-x)=69800
80x+60*1000-60x=69800
(80-60)x=69800-60*1000
20x=9800
x=9800/20=490
所以原方程的解为x=490

回答2: