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11 - (5 - 15) + (7 +35) : 3 =11-(-10)+42:3=11+10+14=35
2.
3
(2 - 4x) + 9(x - 3) = -5x + 5
2-4x+9x-27= -5x+5
-4x+9x+5x=5-2+27
10x=30/:10
x=3
4.
4 - 5 (2x +3) < 7 - 16x
4-10x-15 < 7-16x
-10x+16x < 7-4+15
6x < 18/:6
x < 3
x<-∞:3>
5
O=6πcm
O=2πr
6πcm=2πr/:2π
r=3cm-promień
P=πr²
P=π(3cm)²
P=9πcm²-pole
6.
V=216cm³
V=a³
216cm³=a³
a=∛216cm³
a=6cm-krawędź sześcianu
P=6a²
P=6*(6cm)²
P=6*36cm²
P=216cm²-pole