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2 tháng 10 2019

\(\frac{12}{5}x^2y^2-9x^4-\frac{4}{25}y^4\)

\(=-\left(9x^4-\frac{12}{5}x^2y^2+\frac{4}{25}y^4\right)\)

\(=-\left[\left(3x^2\right)^2-2.3x^2.\frac{2}{5}y^2+\left(\frac{2}{5}y^2\right)^2\right]\)

\(=-\left(3x^2-\frac{2}{5}y^2\right)^2.\)

Chúc bạn học tốt!

15 tháng 7 2021

a. \(9x^2+30x+25=\left(3x+5\right)^2\)

b. \(\dfrac{4}{9}x^4-16x^2=\left(\dfrac{2}{3}x^2-4x\right)\left(\dfrac{2}{3}x^2+4x\right)=x^2\left(\dfrac{2}{3}x-4\right)\left(\dfrac{2}{3}x+4\right)\)

c. \(a^2y^2+b^2x^2-2axby=\left(ay-bx\right)^2\)

d. \(100-\left(3x-y\right)^2=\left(10-3x+y\right)\left(10+3x-y\right)\)

e. \(\dfrac{12}{5}x^2y^2-9x^4-\dfrac{4}{25}y^4=-\left(9x^4-\dfrac{12}{5}x^2y^2+\dfrac{4}{25}y^4\right)=-\left(3x^2-\dfrac{2}{5}y^2\right)^2\)

f. \(64x^2-\left(8a+b\right)^2=\left(8x-8a-b\right)\left(8x+8a+b\right)\)

g. \(27x^3-a^3b^3=\left(3x-ab\right)\left(9x^2+3xab+a^2b^2\right)\)

6 tháng 9 2018

\(25x^2y^4+30xy^2z+9z^2=\left(5xy^2\right)^2+2.5xy^2.3z+\left(3z\right)^2=\left(5xy^2+3z\right)^2\)

\(\frac{16}{9}x^2+4xyz^2+\frac{9}{4}y^2z^4=\left(\frac{4}{3}x\right)^2+2.\frac{4}{3}x.\frac{3}{2}yz^2+\left(\frac{3}{2}yz^2\right)^2=\left(\frac{4}{3}x+\frac{3}{2}yz^2\right)^2\)

\(\frac{9}{25}x^2+\frac{12}{35}xy+\frac{4}{49}y^2=\left(\frac{3}{5}x\right)^2+2.\frac{3}{5}x.\frac{2}{7}y+\left(\frac{2}{7}y\right)^2=\left(\frac{3}{5}x+\frac{2}{7}y\right)^2\)( tự thay vào tính nhé )

\(\frac{25}{16}u^4y^2+\frac{1}{5}u^2+y^3+\frac{4}{625}y^4=\left(\frac{5}{4}u^2y\right)^2+2.\frac{5}{4}u^2y.\frac{2}{25}.y^2+\left(\frac{2}{25}y^2\right)^2=\left(\frac{5}{4}u^2y+\frac{2}{25}y^2\right)^2\)( tự thay vào tính nhé )

Tham khảo nhé~

6 tháng 10 2018

\(\frac{12}{5}x^2y^2-9x^4-\frac{4}{25}y^4\)

\(=-\left(\frac{4}{25}y^4-\frac{12}{5}x^2y^2+9x^4\right)\)

\(=-\left[\left(\frac{2}{5}y^2\right)^2-2\cdot\frac{2}{5}y^2\cdot3x^2+\left(3x^2\right)^2\right]\)

\(=-\left(\frac{2}{5}y^2-3x^2\right)^2\)

6 tháng 10 2018

        \(\frac{12}{5}x^2y^2-9x^4-\frac{4}{25}y^4\)

\(=-\left(9x^4-\frac{12}{5}x^2y^2+\frac{4}{25}y^4\right)\)

\(=-\left[\left(3x\right)^2-2.3x^2.\frac{2}{5}y^2+\left(\frac{2}{5}y^2\right)^2\right]\)

\(=-\left(3x^2+\frac{2}{5}y^2\right)\)

5 tháng 7 2017

a) 9x2+30x+25=32x2+2.3.5x+52=(3x+5)2

b)12/5x2y2-9x4-4/25y4=-(9x4-12/5x2y2+4/25y4)=-(3x-2/5y)2

c)a2y2+b2x22axby=(ax-by)2

d)64x2-(8a+b)2=(8x-8a-b)(8x+8a+b)

a: \(9x^2+30x+25=\left(3x+5\right)^2\)

b: \(\dfrac{4}{9}x^4-16x^2=x^2\left(\dfrac{4}{9}x^2-16\right)=x^2\left(\dfrac{2}{3}x-4\right)\left(\dfrac{2}{3}x+4\right)\)

c: \(\dfrac{12}{5}x^2y^2-9x^4-\dfrac{4}{25}y^4\)

\(=-\left(9x^4-\dfrac{12}{5}x^2y^2+\dfrac{4}{25}y^4\right)\)

\(=-\left(3x^2-\dfrac{2}{5}y^2\right)^2\)

10 tháng 9 2020

\(\left(x+\frac{4}{3}y^2\right)^2=x^2+\frac{8xy^2}{3}+\frac{16y^4}{9}\)

\(\left(2x^2+\frac{5}{3}y\right)^2=4x^4+\frac{20x^2y}{3}+\frac{25y^2}{9}\)

10 tháng 9 2020

\(\left(x+\frac{4}{3}y^2\right)^2=x^2+2\cdot x\cdot\frac{4}{3}y^2+\left(\frac{4}{3}y^2\right)^2=x^2+\frac{8}{3}xy^2+\frac{16}{9}y^4\)

\(\left(2x^2+\frac{5}{3}y\right)^2=\left(2x^2\right)^2+2\cdot2x^2\cdot\frac{5}{3}y+\left(\frac{5}{3}y\right)^2=4x^4+\frac{20}{3}x^2y+\frac{25}{9}y^2\)

23 tháng 6 2023

này mình có vài câu không làm được, xin lỗi bạn nha

\(b,16x^2-8x+1=\left(4x-1\right)^2\\ c,4x^2+12xy+9y^2=\left(2x+3y\right)^2\\ e,=x^2+2x+1+y^2+2y+1+2\left(x+1\right)\left(y+1\right)\\ =\left(x+1\right)^2+2\left(x+1\right)\left(y+1\right)+\left(y+1\right)^2\\ =\left[\left(x+1\right)+\left(y+1\right)\right]^2=\left(x+y+2\right)^2\\ g,=x^2-2x\left(y+2\right)+\left(x+2\right)^2=\left[x-\left(y+2\right)\right]^2=\left(x-y-2\right)^2\\ h,=\left[x+\left(y+1\right)\right]^2=\left(x+y+1\right)^2\)

 

 

 

 

 

 

a) \(\left(5xy^3\right)^2-2.5xy^3.6yz^2+\left(6yz^2\right)^2\)=\(\left(5xy^3-6yz^2\right)^2\)

b) \(\left(\frac{1}{3}u^2v^3\right)^2-2.\frac{1}{3}u^2v^3.\frac{1}{2}u^3v+\left(\frac{1}{2}u^3v\right)^2\)=\(\left(\frac{1}{3}u^2v^3-\frac{1}{2}u^3v\right)^2\)