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huyhoang88ab

2 năm trước

Loga Sinh Học lớp 12

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mquan210901

Đáp án:

Giải thích các bước giải:

1) 5x^2. y - 10xy^2

= 5xy.x - 2y .5xy

= 5xy.(x-2y)

2) 4x (2y-z ) +7y (z-2y)

= 4x (2y-z) +7y.[- (2y-z)]

= 4x (2y-z) -7y (2y-z)

= (4x -7y) (2y-z)

3) 3x^3 .y^2 - 6x^2.y^3 +9x^2 .y^2

= x. 3x^2. y^2 - 2y. 3x^2 .y^2+ 3.3x^2.y^2

= 3x^2.y^2 .( x -2y +3)

4) 5x^2 .y^3 -25x^3. y^4 +10x^3.y^3

= 5x^2.y^3 - 5xy . 5x^2 .y^3 + 2x .5x^2.y^3

= 5x^2. y^3 .(1- 5xy +2x)

5) 12x^2.y - 18 xy^2 -30y^2

= 6y. 2x^2 - 3xy . 6y - 5y. 6y

= 6y.( 2x^2 -3xy -5y)

6) 5(x-y) -y(x-y)

= (5-y)(x-y)

7 ) y(x -z ) +7 (z-x)

= y(x-z) +7[-(x-z)]

= y(x-z) -7(x-z)

= (y-7) (x-z)

8) 27x^2 (y-1) -9x^3 (1-y)

= 27x^2 (y-1) -9x^3 [-(y-1)]

= 27x^2 (y-1) -9x^3 (y-1)

= 9x^2 .3 (y-1) - x. 9x^2 (y-1)

= 9x^2 .(3-x)(y-1)

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700042400911072

Đáp án:

Giải thích các bước giải:

Bài đây ạ

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