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1.
(2a+3)²-(a-2)(2a-2)=2a²+12a+9-(2a²+2)=2a²+12a+9-2a²-2=12a+7
2. niestety nie wiem
3.
(x-1)²-(x-2)(x+2)=9
x²-2x+2-(x²-4)=9
x²-2x+2-x²+4=9
2x=9-2-4
2x=3/:2
x=3/2
x=1 ½
4.
½x²-5x+3=0
½x²-5x=-3
5.
(x+2)²<(x-7)(x+7)
x²+4x+4<x²-49
x²-x²+4x<-49-4
4x<-53/:4
x<-13 ¼
GR II
1.
(a-3)(2a-5)-(3a+1)²=2a²-5a-6a+15-(9a²+6a+1)=2a²-11a+15-9a²-6a-1=-7a²-17a+14
3.
(x+2)²+(1-x)(1+x)=1
x²+4x+4+1-x²=1
4x=1-1-4
4x=-4/:4
x=-1
4.
¼x²-4x-1=0
¼x²-4x=1
??????
5.
(x-3)²>(x+5)(x-5)
x²-6x+9>x²-25
x²-x²-6x=-25-9
-6x=-34/:(-6)
x=5 ⅔