1/2x+1/6x=4 x-2/7x=3/4

问题描述:

1/2x+1/6x=4 x-2/7x=3/4

(3/6+1/6)x=4
4/6×=4
x=6(1-2/7)x=3/4
5/7x=3/4
x=21/20点采纳!谢谢!请采纳!