1. 3x = 1/27; x = (1/27)/3;
x = 1/81.
2. 4x = 16; x = 16/4;
x = 4.
3. 4x = 1/64; x = (1/64)/4;
x = 1/256.
4. 4x = 1/4; x = (1/4)/4;
x = 1/16.
5. 5x = 1/25; x = (1/25)/5
x = 1/125.
6. 5x = 1/625; x = (1/625)/5
x = 1/3125
7. 5x = 125; x = 125/5
x = 25.
8. 6x = 1/36; x = (1/36)/6
x = 1/216.
9. 7x = 1/49; x = (1/49)/7
x = 1/343.
10. 7x = 49; x = 49/7
x = 7.
(8*30-30)/3*5 вот так это просто
8*30=240
240-30=210
210/3=70
70*5=350
180:15=12стр- печают две машины за 1 мин
12-6=6стр- печает за 1 мин вторая машина
X²-9x=0
x(x-9)=0
x=0 или x-9=0
x=9
Ответ: x₁=0; x₂=9