解方程.4% 2.8:X=6:13 14-3X=18÷9.

问题描述:

解方程.4%
2.8:X=6:13                        
14-3X=18÷9.

(1)2.8:x=6:13,            6x=2.8×13,            6x=36.4,    &n...