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ob₂= 2*6+2*8= 28, c=6, d=8
Ob₁/Ob₂=k
10/28= x/6
28a= 60 /28
a= dwa i jedna siódma (2 1/7)
10/28= y/8
5/14= y/8
14y=40 /14
y= 2 6/7
Ob₂=(2 1/7)² *( 2 6/7)²=( 15/7)² * (20/7)²=225/49 * 400/49=38,5
2. 7,2/ 8,4= 4,8/y
7,2 y= 40,32 /7,2
y= 5,6
8,8/5,6= x/8,4
5,6x= 73,92 /5,6
x=13,2
3.Pole ABCD= 54cm²
k=3
A'B'C'D' /ABCD= 3²
A'B'C'D' /54= 9
A'B'C'D' = 486- pole
4. sinα= 2/√13
cosα= 3/√13
sinα + cosα= 5/√13
8. a) 2x²-x+5+4x³-2x²+1=4x³-x+6
b) 4x³-2x²+1-(2x²-x+5) * (x³+x-6)= 4x³-2x²+1-( 2x⁵+2x³-18x²-x⁴-x² +6x+5x³+5x-30)=4x³-2x²+1-(2x⁵-x⁴+7x³-19x²+11x-30)=4x³-2x²+1-
2x⁵+x⁴-7x³+19x²-11x+30=2x⁵+x⁴-3x³+17x²-11x+29
10.a) x³+9x=x(x²*9)
d) x²-6x+9= (x-3)²
e) (x²-4) (x+5)
g) 2x*(x²-5x+6)
h) x²(x-6)-4(x-6)= (x²-4) (x-6)
i) 4x²(x+2)-3(x+2)= (4x²-3) (x+2)
Mam nadzieję,że pomogłam :)