20.解方程.
0 154708 154716 154722 154726 154732 154734 154738 154744 154746 154752 154758 154762 154764 154768 154774 154776 154782 154786 154788 154792 154794 154798 154800 154802 154803 154804 154806 154807 154808 154810 154812 154816 154818 154822 154824 154828 154834 154836 154842 154846 154848 154852 154858 154864 154866 154872 154876 154878 154884 154888 154894 154902 199269
| $\frac{3}{5}$x+x=16 | 2.4x-10=6.8 | x-68%x=19.2 |