Đáp án:
1,(x+2y)²=x²+4xy+4y²
2,(2x+3y)²=4x²+12xy+3y²
3,(3x-2y)²=9x²-12xy+4y²
4,(5x-y)²=25x²-10xy+y²
5,(x+1/4)²=x²+1/2x+1/8
6,(2x-1/2)²=4x²-2x+1/4
7,(1/3x-1/2y)²=1/9x²-1/3xy+1/4y²
8,(3x-1)(3x+1)=9x²-1
9,(x²+2/5y)(x²-2/5y)=x mũ4-4/25y²
10,(x/2-y)(x/2+y)=x²/4-y²
Xin ctlhn nha!!!