x的9倍比它的4.2倍多7.2,
问题描述:
x的9倍比它的4.2倍多7.2,
答
9x-4.2x=7.2
4.8x=7.2
x=7.2/4.8
x的9倍比它的4.2倍多7.2,
9x-4.2x=7.2
4.8x=7.2
x=7.2/4.8