zadanie 2
a)
M =4-3ba
3ba=4-M
a=\frac{4-M}{3b}
b)
V=\frac{2a}{5p+4}
2a=V(5p+4)
a=\frac{V(5p+4)}{2}
c)
R(n-3a)=P
Rn-3Ra=P
-3Ra=-Rn+P|*(-1)
3Ra=Rn-P
a=\frac{Rn-P}{3R}
zadanie 3
a)-5x+4>-3x-10
-5x+3x>-10-4
-2x>-14 |:(-2)
x<7
b)
5-3(x-6) ≥ 2+5x
5-3x+18\geq 2+5x
23-3x\geq 2+5x
-3x-5x \geq 2-23
-8x\geq -21 |:(-8)
x\leq \frac{21}{8}
x\leq 2\frac{5}{8}
c)
(7(x-3))/-3<x
\frac{7(x-3)}{-3}< x
\frac{7x-21}{-3} < x |*(-3)
7x-21>-3x
7x+3x>21
10x>21
x>\frac{21}{10}
x>2,1