<span>a) 2z - 12 = 4
2z=4+12
z=8
</span><span>б) 7y-3 = 5-3y
</span>7y+3y=3+5
10y=8
y=0?8
5x-3 < 3x-5
5x-3x < 3-5
2x < -2
x < -2:2
x < -1
x ∈ (-∞; -1)
25х+14х-3=0
39x-3=0
39x=0+3
x=
= (2*5)^6 - (3*5)^5 = = (2^6)(5^6)-(3^5)(5^5)=
(5^5)(5*2^6-3^5)=(5^5)(320-243)=(5^6)(320-243)=
(5^5)77=(5^5)*11*7
простые делители: 1,5,7.
135 ,131 ,246,357 468 579