POTRZEBUJE NA JUTRO. PILNE!
1.
a)
(5x-2)²-(25x²-4)
x=0,2
(5x-2)²-(25x²-4)=1-1+4=4
b)
9x²-25=18-25=-7
2.
4x(-x²+0,5)-2x
25y²-3x(10y-3x)
c)
x²(a+b)+y²(a+b)=(a+b)(x²+y²)
zad.3
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1.
a)
(5x-2)²-(25x²-4)
x=0,2
(5x-2)²-(25x²-4)=1-1+4=4
b)
9x²-25=18-25=-7
2.
a)
4x(-x²+0,5)-2x
b)
25y²-3x(10y-3x)
c)
x²(a+b)+y²(a+b)=(a+b)(x²+y²)
zad.3
a)![\frac{3}{2+\sqrt{2}}*\frac{2-\sqrt{2}}{2-\sqrt{2}}=(6-3\sqrt{2}):2=3-\frac{3}{2}\sqrt2} \frac{3}{2+\sqrt{2}}*\frac{2-\sqrt{2}}{2-\sqrt{2}}=(6-3\sqrt{2}):2=3-\frac{3}{2}\sqrt2}](https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B2%2B%5Csqrt%7B2%7D%7D%2A%5Cfrac%7B2-%5Csqrt%7B2%7D%7D%7B2-%5Csqrt%7B2%7D%7D%3D%286-3%5Csqrt%7B2%7D%29%3A2%3D3-%5Cfrac%7B3%7D%7B2%7D%5Csqrt2%7D)
b)