1. (а-9)²-(81+2а)=a²-18a+81-81-2a=a²-20a
2. (3а-а²)²-а²(а-2)(а+2)+2(7а+3а²)=9a²-6a3+a4-a4+4a²+14a+6a²=19a²-6a3+14a
3. (2-х)²-х(х+1,5)=4
4-4x+x²-x²-1,5x=4
5,5x=0
x=0
1. (а-9)²-(81+2а)=a²-18a+81-81-2a=a²-20a
2. (3а-а²)²-а²(а-2)(а+2)+2(7а+3а²)=9a²-6a3+a4-a4+4a²+14a+6a²=19a²-6a3+14a
3. (2-х)²-х(х+1,5)=4
4-4x+x²-x²-1,5x=4
5,5x=0
x=0