Zadanie 1
a)
[tex](3x-5y)(7y+2x) = 3x(7y+2x) - 5y(7y+2x) = 21xy + 6x^{2} - 35y^{2} -10xy = 6x^{2}-35y^{2} +11xy[/tex]
b)
[tex](t+2)(4-5t) = t(4-5t) + 2(4-5t) = 4t-5t^{2}+8-10t=-5t^{2}-6t+8[/tex]
Zadanie 2
[tex]3(x-y)-(x-y) = 3x-3y-x -(-y) = 2x-2y[/tex]
[tex]2(3x+5)+4(3x+5)=6x+10+12x+20=18x+30[/tex]
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Zadanie 1
a)
[tex](3x-5y)(7y+2x) = 3x(7y+2x) - 5y(7y+2x) = 21xy + 6x^{2} - 35y^{2} -10xy = 6x^{2}-35y^{2} +11xy[/tex]
b)
[tex](t+2)(4-5t) = t(4-5t) + 2(4-5t) = 4t-5t^{2}+8-10t=-5t^{2}-6t+8[/tex]
Zadanie 2
a)
[tex]3(x-y)-(x-y) = 3x-3y-x -(-y) = 2x-2y[/tex]
b)
[tex]2(3x+5)+4(3x+5)=6x+10+12x+20=18x+30[/tex]