(перевожу степени)
1) 5 в 3 ст. = 125
2) 2 во 2 ст. = 4
3) 25 во 2 ст. = 625
(125+х) * 4 = 625 - 3*5*7
(125+х) * 4 = 625-105
(125+х) * 4 = 520
125+х = 520 : 4
125+х = 130
х = 130 - 125
х = 5
4a+90a=94a
86b-77b=9b
209m+m=210m
302n-n=301n
<span>4•4=4</span>⁴<span>
10•10=10</span>¹⁰<span>
30•30=30</span>³⁰<span>
5•5=5</span>⁵<span>
8•8=8</span>⁸<span>
3•3=3</span>³<span>
20•20=20</span>²⁰<span>
6•6=6</span>⁶
Y:9=745-637
y:9=108
y=108:9
y=12