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3x=4-5
-3x=-1/:(-3)
x= 0,(3)
1/2x-1-(x+1)=(1-x)(1+x)
1/2x -1-x-1=1-x+1+x
1/2x-x+x-x=1-1+1
-1/2x=1/:(-1/2)
x=-1/2
-3x=-1 v -3x=-9
x=1/3 v x=3
b) 1/2x-1-(x+1)²=(1-x)(1+x)
1/2x-1-(x² +2x+1)=1-x²
1/2x-1-x²-2x-1=1-x²
1/2x-x²-2x+x²=1+2
-3/2x=3
x=-2
Mam nadzieję, że pomogłam:) Liczę na najjjj:))
-3x=-1|:-3
x=1/3
b)1/2x-1-x²+2x+1=1+x-x-x²|*2
x-2-2x²+4x+2=2-2x²
5x=2|:5
x=5/2