Ai giúp em vs nhé ;-;

Đáp án + Giải thích các bước giải:

 ` A= x^2-4x+3`

` A= x^2-x-3x+3`

`A= x(x-2)-3(x-1)`

`A= (x-3)(x-1)` 

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`B=x^2+4x-12` 

`B=x^2+6x-2x-12` 

`B=x(x+6)-2(x+6)`

`B=(x-2)(x+6)` 

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`C=x^2-2xy-3y^2` 

`C=x^2-3xy+xy-3y^2`

`C=x(x-3y)+y(x-3y)`

`C=(x+y)(x-3y)` 

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`D= 4x^2-36x+56` 

`D=4x^2-8x-28x+56`

`D=4x(x-2)-28(x-2)`

`D=(4x-28)(x-2)`

`D=4(x-7)(x-2)` 

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`E= x^2-7xy+10y^2`

`E= x^2-2xy-5xy+10y^2`

`E=x(x-2y)-5y(x-2y)`

`E=(x-5y)(x-2y)` 

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`F=9-6x+x^2-y^2`

`F=(2-x)^2-y^2`

`F=(2-x-y)(2-x+y)` 

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` Sửa: ` `G=x^3+6x^2y+12xy^2+8y^3`

`G=(x+2)^3`

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`H= x^3-6x^2+12x-8`

`H= (x-2)^3`