Question

giúp mik câu e,f,g,h 

Answer 1

\(e,=\left[\left(2x+3\right)-2\left(x-1\right)\right]\left[\left(2x+3\right)+2\left(x-1\right)\right]\\ =\left(2x+3-2x+2\right)\left(2x+3+2x-2\right)\\ =5\left(4x+1\right)\\ f,=\left(3x+2y\right)^2-\left(3x-1\right)^2\\ =\left(3x+2y-3x+1\right)\left(3x+2y+3x-1\right)=\left(2y+1\right)\left(6x+2y-1\right)\\ g,Sửa:2x^2-4xy+x-2y\\ =2x\left(x-2y\right)+\left(x-2y\right)\\ =\left(2x+1\right)\left(x-2y\right)\\ h,=\left(x-y\right)\left(x+y\right)-3\left(x+y\right)\\ =\left(x-y-3\right)\left(x+y\right)\)

Answer 2

`a.=x(x-4)`

`b.=4(2x+5y)`

`c.=xy(x-y)-2(x-y)`

`=(xy-2)(x-y)`

`d.=(x-y)[2x(x-y)+xy]`

`=(x-y)(2x^2 -2xy+xy)`

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

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

`e.=(2x+3)^2 -(4x-1)^2`

`=[(2x+3)-(4x-1)][(2x+3)+(4x-1)]`

`=(2x+3-4x+1)(2x+3+4x-1)`

`=(-2x+4)(6x+2)`

`=4(-x+2)(3x+1)`

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