Đáp án:
`a,` `(x+5)^2`
`=x^2+10x+25`
`=>` `(a+b)^2=a^2+2ab+b^2`
`b,` `(5/2-x)^2`
`=25/4-5x+x^2`
`=>` `(a-b)^2=a^2-2ab+b^2`
`c,` `(2x+3y)^2`
`=4x^2+12xy+9y^2`
`=>` `(a+b)^2=a^2+2ab+b^2`
`d,` `(-1/8x+2/3y)^2`
`=(2/3y-1/8x)^2`
`=4/9y^2-1/6xy+1/64x^2`
`=>` `(a-b)^2=a^2-2ab+b^2`
`e,` `(x/4-y/6)(x/4+y/6)`
`=(x/4)^2-(y/6)^2`
`=x^2/16-y^2/36`
`=>` `(a-b)(a+b)=a^2-b^2`
`d,` `(2x-y)^2`
`=4x^2-4xy+y^2`
`=>` `(a-b)^2=a^2-2ab+b^2`
`g,` `(4/3x-1/2y)^2`
`=16/9x^2-4/3xy+1/4y^2`
`=>` `(a-b)^2=a^2-2ab+b^2`
`h,` `(3/4x^2-1)^2`
`=9/16x^4-3/2x^2+1`
`=>` `(a-b)^2=a^2-2ab+b^2`
