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x(2x*-x+7)=2xkwadrat-xkwadrat+7x= xkwadrat +7x
b)
5a(a-2)=2a(a+5)=
5a^-10a=2a^+10a
5a^-2a^=10a+10a
3a^=20a
(^------>oznacza do kwadratu)
c)
4(a+b)-(b-a)=
.........2......
4a+4b-b+a/2=5a+3b/2=2,5a+1,5b
d)
9xy+6x(y-3x)=
........3x...........
9xy+6xy-18x^ /3x= 3y+2y-6x= -6x+5y
zad2. wyłącz wspólny czynnik przed nawias
-0,25x-0,75y-1,5= 0,25(-x-3y-6)
c) [4(a+b)-(b-a)] :2= [4a+4b-b+a] :2=[5a-3b]:2= 2,5a-1,5b
d) [9xy+6x(y-3x)] :3x= [9xy+6xy-9x²]:3x= [15xy-9x²]:3x
zad 2
-0.25(x-3y-6)