K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

6 tháng 7 2022

Ta có: \(\left(1+2a\right)\left(1-2a\right)-a\left(a+2\right)\)

\(=1-4a^2-a^2-2a\)

\(=-5a^2-2a+1\)

 

6 tháng 7 2022

Nhầm yêu cầu đề không bạn?

\(\left(1+2a\right)\left(1-2a\right)-a\left(a+2\right)\)

\(=1-\left(2a\right)^2-a\left(a+2\right)\)

\(=1-4a^2-a\left(a+2\right)\)

\(=1-4a^2-a^2-2a\)

\(=-5a^2-2a+1\)

16 tháng 9 2023

\(a^7-a^5+2a^3+2a^2\\ =a^5\left(a^2-1\right)+2a^2\left(a+1\right)\\ =a^5\left(a-1\right)\left(a+1\right)+2a^2\left(a+1\right)\\ =a^2\left(a+1\right)\left(a^4-a^3+2\right)\)

16 tháng 9 2023

\(a^7-a^5+2a^3+2a^2=a^5\left(a^2-1\right)+2a^2\left(a+1\right)\)

\(=\left(a+1\right)\left[a^5\left(a-1\right)+2a^3\right]\)

\(=a^3\left(a+1\right)\left[a^2\left(a-1\right)+2\right]\)

\(=a^3\left(a+1\right)\left(a^3-a^2-2\right)\)

14 tháng 7 2019

\(2a^2b\left(a-1\right)+2a\left(1-a\right)\)

\(=2a^2b\left(a-1\right)-2a\left(a-1\right)\)

\(=2a^2b\left(a-1\right)\left(ab-1\right)\)

13 tháng 8 2015

a)  4(2x-3)^2-9(4x^2-9)^2

=[2(2x-3)]^2-[3(4x^2-9)]^2

=(4x-6)^2-(12x^2-27)^2

=(4x-6+12x^2-27)(4x-6-12x^2+27)

=(12x^2+4x-33)(4x-12x^2+21)

b)  a^6-a^4+2a^3+2a^2

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

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

=(a+1)[(a^4)(a-1)+2a^2]

=(a+1)(a^5+a^4+2a^2)

`a^2 + ab + 2a + 2b = a(a+2) + b(a+2) = (a+b)(a+2)`

20 tháng 7 2021

a, \(4abc-8ab^2c=4abc\left(1-2b\right)\)

b, \(x^2\left(2a-1\right)+x\left(1-2a\right)=x^2\left(2a-1\right)-x\left(2a-1\right)\)

\(=x\left(x-1\right)\left(2a-1\right)\)

c, \(9a^4\left(a-2\right)+a^2\left(a-2\right)=a^2\left(9a^2+1\right)\left(a-2\right)\)

d, \(\left(a-4\right)\left(2a-1\right)-8a+4=\left(a-4\right)\left(2a-1\right)-4\left(2a-1\right)\)

\(=\left(a-8\right)\left(2a-1\right)\)

20 tháng 7 2021

a) `4abc-8ab^2c=4abc(1-2b)`

b) `x^2 (2a-1)+x(1-2a) = x^2 (2a-1) -x(2a-1) = (2a-1)(x^2-x)=x(2a-1)(x-1)`

c) `9a^4 (a-2) +a^2 (a-2) = (a-2)(9a^4+a^2)=a^2 (a-2)(9a^2+1)`

d) `(a-4)(2a-1)-8a+4=(a-4)(2a-1)-4(2a-1)=(2a-1)(a-8)`

30 tháng 9 2016

\(36\left(a-b\right)^2-25\left(2a-1\right)^2=\left[6\left(a-b\right)\right]^2-\left[5\left(2a-1\right)\right]^2\)

\(=\left(6a-6b\right)^2-\left(10a-5\right)^2=\left(6a-6b-10a+5\right)\left(6a-6b+10a-5\right)\)

\(=\left(-4a-6b+5\right)\left(16a-6b-5\right)\)

22 tháng 10 2021

\(a,=\left(xy-1-x-y\right)\left(xy-1+x+y\right)\\ b,Sửa:a^3+2a^2+2a+1\\ =a^3+a^2+a^2+a+a+1=\left(a+1\right)\left(a^2+a+1\right)\\ c,=1-4a^2-a\left(a^2-4\right)=1-4a^2-a^3+4a\\ =\left(1-a\right)\left(1+a+a^2\right)+4a\left(1-a\right)\\ =\left(1-a\right)\left(1+5a+a^2\right)\\ d,=\left(a^2-a^2b^2\right)+\left(b^2-b\right)+\left(ab-a\right)\\ =a^2\left(1-b\right)\left(1+b\right)+b\left(b-1\right)+a\left(b-1\right)\\ =\left(b-1\right)\left(-a^2-ab+b+a\right)\\ =\left(b-1\right)\left(b-1\right)\left(a+b\right)\left(1-a\right)\)

\(e,=x^2y+xy^2-yz\left(y+z\right)+x^2z-xz^2\\ =\left(x^2y+x^2z\right)+\left(xy^2-xz^2\right)-yz\left(y+z\right)\\ =x^2\left(y+z\right)+x\left(y-z\right)\left(y+z\right)-yz\left(y+z\right)\\ =\left(y+z\right)\left(x^2+xy-xz-yz\right)\\ =\left(y+z\right)\left(x+y\right)\left(x-z\right)\)

\(f,=xyz-xy-yz-xz+x+y+z-1\\ =xy\left(z-1\right)-y\left(z-1\right)-x\left(z-1\right)+\left(x-1\right)\\ =\left(z-1\right)\left(xy-y-x+1\right)=\left(z-1\right)\left(x-1\right)\left(y-1\right)\)

3 tháng 10 2021

\(a\sqrt{a}+2a+\sqrt{a}+2=\left(a\sqrt{a}+2a\right)+\left(\sqrt{a}+2\right)\)

\(=a\left(\sqrt{a}+2\right)+\left(\sqrt{a}+2\right)=\left(\sqrt{a}+2\right)\left(a+1\right)\)

3 tháng 10 2021

\(a\sqrt{a}+2a+\sqrt{a}+2=a\left(\sqrt{a}+2\right)+\left(\sqrt{a}+2\right)=\left(a+1\right)\left(\sqrt{a}+2\right)\)

17 tháng 7 2018

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

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

= -2a(a-2)(1-x)

= 2a(a-2)(x-1)

17 tháng 7 2018

\(-2a^2\left(x-1\right)+4a\left(1-x\right)\)

\(=-a\cdot2a\left(x-1\right)-2\cdot2a\left(x-1\right)\)

\(=2a\left(x-1\right)\left(-a-2\right)\)