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Toán Lớp 8: 8. 25x ² – 10x + 1= 9. 5x ² – 20= 10. 1+8x= 11. 125x ³ – 8= 12. x^4 – 1= 13. (x-5) ² – 4y ²= 14. x ³y – 64y=

Home/ Toán Lớp 8: 8. 25x ² – 10x + 1= 9. 5x ² – 20= 10. 1+8x= 11. 125x ³ – 8= 12. x^4 – 1= 13. (x-5) ² – 4y ²= 14. x ³y – 64y=

Toán Lớp 8: 8. 25x ² – 10x + 1= 9. 5x ² – 20= 10. 1+8x= 11. 125x ³ – 8= 12. x^4 – 1= 13. (x-5) ² – 4y ²= 14. x ³y – 64y=

Cát Tiên Tháng Mười 21, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 8. 25x ² – 10x + 1=
9. 5x ² – 20=
10. 1+8x=
11. 125x ³ – 8=
12. x^4 – 1=
13. (x-5) ² – 4y ²=
14. x ³y – 64y=

Comments ( 1 )

thudan
21 Tháng Mười, 2022 at 10:35 sáng

Reply

8) 25x^2-10x+1

=(5x)^2-2.5x.1+1^2

=(5x-1)^2

* (a-b)^2=a^2-2ab+b^2

9) 5x^2-20

=5(x^2-4)

=5(x-2)(x+2)

* Đặt nhân tử chung

* a^2-b^2=(a-b)(a+b)

10) 1+8x^3

=1^3+(2x)^3

=(1+2x)(1-2x+4x^2)

* a^3+b^3=(a+b)(a^2-ab+b^2)

11) 125x^3-8

=(5x)^3-2^3

=(5x-3)(25x^2+10x+4)

* a^3-b^3=(a-b)(a^2+ab+b^2)

12) x^4-1

=(x^2-1)(x^2+1)

=(x-1)(x+1)(x^2+1)

* a^2-b^2=(a-b)(a+b)

13) (x-5)^2-4y^2

=(x-5)^2-(2y)^2

=(x-5-2y)(x-5+2y)

* a^2-b^2=(a-b)(a+b)

14) x^3y-64y

=y(x^3-64)

=y(x-4)(x^2+4x+16)

* Đặt nhân tử chung

* a^3-b^3=(a-b)(a^2+ab+b^2)

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