2X除以7加4分之1X的和除以5X除以7加3X除以4等于?

问题描述:

2X除以7加4分之1X的和除以5X除以7加3X除以4等于?

2X除以7加4分之1X的和除以5X除以7加3X除以4
=(2X/7 +X/4) / (5X/7 +3X/4)
=(8X +7X) / (20X +21X)
=15/41