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2. a)2(3x+y)=2×3x+2×y=6x+2y b)0,7×2a-0,7×3b=1,4a-2,1b c)-1,2×5x-2×(-1,2)=-6x-(-2,4)=6x+2,4
-4a * 2a^3 = -8a^4
2/3x^2 * 3/5x^4 = 6/15x^6
zad 2
2( 3x + y ) = 6x + 2y
0,7( 2a - 3b ) = 1,4a -2,1b
-1,2( 5x - 2 ) = -6x + 2,4