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k305
@k305
June 2021
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Алгебра. Пожалуста, срочно,помогите!!!
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TMBLRqueen
1.
а)(а+3)(b-7)=ab-7a+3b-21
б)(x-4)(x+8)=x^2+4x-32
в)(x-9)(x-5)=x^2-14x+45
г)(3a-2b)(2a-3b)=6a^2-9ab-4ab+6b^2=6a^2-13ab+6b^2
д)(2a-1)(3a+7)=6a^2+11a-7
е)(m^2-n)(m+n^2)=m^3+m^2n^3-mn-n^3
2.
a)(3a+5)(3a-6)+30=9a^2-3a-30+30=9a^2-3a
б)(x-3)(x+5)-(x^2+x)=x^2+2x-15-x^2-x=x-15
в)(y+2)(y+3)-y(y-1)=y^2+5y+6-y^2+y=6y+6
г)3b^2+(8-3b)(b+5)=3b^2+8b+40-3b^2-15b=40-7b
д)8x-(3x+1)(5x+1)=8x-15x^2-8x-1=15x^2-1
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Answers & Comments
а)(а+3)(b-7)=ab-7a+3b-21
б)(x-4)(x+8)=x^2+4x-32
в)(x-9)(x-5)=x^2-14x+45
г)(3a-2b)(2a-3b)=6a^2-9ab-4ab+6b^2=6a^2-13ab+6b^2
д)(2a-1)(3a+7)=6a^2+11a-7
е)(m^2-n)(m+n^2)=m^3+m^2n^3-mn-n^3
2.
a)(3a+5)(3a-6)+30=9a^2-3a-30+30=9a^2-3a
б)(x-3)(x+5)-(x^2+x)=x^2+2x-15-x^2-x=x-15
в)(y+2)(y+3)-y(y-1)=y^2+5y+6-y^2+y=6y+6
г)3b^2+(8-3b)(b+5)=3b^2+8b+40-3b^2-15b=40-7b
д)8x-(3x+1)(5x+1)=8x-15x^2-8x-1=15x^2-1