4X减十五之七等于十五之七
问题描述:
4X减十五之七等于十五之七
答
4X - 7/15 = 7/15
4X = 14/15
X = 7/30
4X减十五之七等于十五之七
4X - 7/15 = 7/15
4X = 14/15
X = 7/30