<span>3^х-3^х-3=-78
3 (1^x - 1^x - 1) = -78
</span>
<span>1^x - 1^x - 1 = -78 / 3
</span><span>1^x - 1^x - 1 = -26
</span>
<span><span>1^x - 1^x = -26</span> + 1
</span><span>1^x - 1^x = -25
</span>
1)28+40=68%
2)4 кг-100%
х кг-68%
х=4*68/100=2.72 кг.
1)180252:9=20028
2)20028+7592=27620
3)4384-256=4128
4)4128*14=57792
5)200412-27620=172792
6)172792-57792=115000
7)115000+864=115864