晕,上面帮你做答案都是错的
15/14 - 5/4 + x = 1
1.化分母
(30/28 - 35/28) + x =1
2.合并
(30-35)/28 + x = 1
3.移
x = 1- (30-35)/28
4.结果
x = 33/28