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sonnyacho
@sonnyacho
July 2022
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Решите все задания, пожалуйста. Написано на листочке. Даю 30 б.
8 класс, математика.
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sedinalana
(3a+2b)(2b-3a)=4b²-9a²
(-4n³+n)(4n³+n)=n²-16n^6
-------------------------------
2b(a²+b³)=2a²b+2b^4
2b³(a²+b³-c)=2a²b³+2b^6-2b³c
------------------------------
(x+1)(x+2)=x²+2x+x+2=x²+3x+2
(2m+n²)(2n-m²)=4mn-2m³+2n³-n²m²
---------------------------------
(x²+2y)(x²+2y)-(x²-2y)(x²+2y)=x^4+2x²y+4y²-x^4+4y²=2x²y+8y²
----------------------------
2a+3b-5a-3b=-3a
5x-3y+2x+3y=7x
2 votes
Thanks 2
doramaandkpop
Что делать с тремя верхними примерами не поняла
1. 2b*(a^2+b^3) = 2ba^2+2b^4
2b^3*(a^2+b^3-c) = 2b^3a^2+2b^6-2cb^3
2) a)(x+1)*(x+2) = x^2+2x+x+2 = x^2+3x+2
b) (2m+n^2)*(3n-m^2) =6mn-2m^3+3n^3-m^2n^2
3) (x^2+2y)*(x^2+2y)-(x^2-2y)*(x^2+2y)=(x^2+2y)*((x^2+2y)-(x^2-2y))= (x^2+2y)*(x^2+2y-x^2+2y)= (x^2+2y)*4y= 4yx^2+8y^2
3) 1) 2a+3b-5a-3b= -3a
2)5x-3y+2x+3y= 7x
0 votes
Thanks 0
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Answers & Comments
(-4n³+n)(4n³+n)=n²-16n^6
-------------------------------
2b(a²+b³)=2a²b+2b^4
2b³(a²+b³-c)=2a²b³+2b^6-2b³c
------------------------------
(x+1)(x+2)=x²+2x+x+2=x²+3x+2
(2m+n²)(2n-m²)=4mn-2m³+2n³-n²m²
---------------------------------
(x²+2y)(x²+2y)-(x²-2y)(x²+2y)=x^4+2x²y+4y²-x^4+4y²=2x²y+8y²
----------------------------
2a+3b-5a-3b=-3a
5x-3y+2x+3y=7x
1. 2b*(a^2+b^3) = 2ba^2+2b^4
2b^3*(a^2+b^3-c) = 2b^3a^2+2b^6-2cb^3
2) a)(x+1)*(x+2) = x^2+2x+x+2 = x^2+3x+2
b) (2m+n^2)*(3n-m^2) =6mn-2m^3+3n^3-m^2n^2
3) (x^2+2y)*(x^2+2y)-(x^2-2y)*(x^2+2y)=(x^2+2y)*((x^2+2y)-(x^2-2y))= (x^2+2y)*(x^2+2y-x^2+2y)= (x^2+2y)*4y= 4yx^2+8y^2
3) 1) 2a+3b-5a-3b= -3a
2)5x-3y+2x+3y= 7x