Đáp án + Giải thích các bước giải:
e)
`(x-3/4)^2`
`=x^2-2*x*3/4+(3/4)^2`
`=x^2-3/2x+9/16`
f)
`(3x+1)^2`
`=(3x)^2+2*3x*1+1^2`
`=9x^2+6x+1`
g)
`(3x+1/3)(1/3-3x)`
`=(1/3)^2-(3x)^2`
`=1/9-9x^2`
h)
`(x^2-2)^2`
`=(x^2)^2-2*x^2*2+2^2`
`=x^4-4x^2+4`
`--------`
e)
`(x/4-y/6)(x/4+y/6)`
`=(x/4)^2-(y/6)^2`
`=(x^2)/16-(y^2)/36`
f)
`(2x-y)^2`
`=(2x)^2-2*2x*y+y^2`
`=4x^2-4xy+y^2`
g)
`(4/3x-1/2y)^2`
`=(4/3x)^2-2*4/3x*1/2y+(1/2y)^2`
`=16/9x^2-4/3xy+1/4y^2`
h)
`(3/4x^2-1)^2`
`=(3/4x^2)^2-2*3/4x^2*1+1^2`
`=9/16x^4-3/2x^2+1`
