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Hello545
@Hello545
August 2021
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1.Упростите выражение: а) 3а2в·(-5а3в); б) (2х2у)3; в) (3х-1)(3х+1)+(3х+1)2; г) (а-3)(2а+1)-а(2а-7);
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miron2077
Verified answer
3*2*(-5)*3*а*в=-90ав
2*2*3*х*у=12ху
9х²-3х+3х-1+6х+2=9х²+6х+1=(3х+1)²
2а²-6а+а-3-2а²+7а=2а-3
2 votes
Thanks 4
Радость25
А) 3а*2b*(-5a*3b)=6ab*(-15ab)=-90a^2*b^2
б) (2x*2y)*3=4xy*3=12xy
в) (3x-1)(3x+1)+(3x+1)*2=(3x+1)(3x-1+2)=(3x+1)(3x+1)=9x^2+6x+1
г) (a-3)(2a+1)-a(2a-7)=2a^2+a-6a-3-2a^2+7a=-5a+7a-3=2a-3
5 votes
Thanks 11
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Answers & Comments
Verified answer
3*2*(-5)*3*а*в=-90ав2*2*3*х*у=12ху
9х²-3х+3х-1+6х+2=9х²+6х+1=(3х+1)²
2а²-6а+а-3-2а²+7а=2а-3
б) (2x*2y)*3=4xy*3=12xy
в) (3x-1)(3x+1)+(3x+1)*2=(3x+1)(3x-1+2)=(3x+1)(3x+1)=9x^2+6x+1
г) (a-3)(2a+1)-a(2a-7)=2a^2+a-6a-3-2a^2+7a=-5a+7a-3=2a-3