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IvanKabakov
@IvanKabakov
September 2021
1
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Раскройте скобки:
1) 2*(a-9)-3
2) -3*(x+2)+10
3) 5*(4-x)-(-5x+1)
4) -3*(2x+5)+(15-a)
5) x*(a-b)-(c-bx)
6) -5*(m-1)+12
7) 3*(x-3)-9
8) 2*(7-x)-(4-2x)
9) -0,5*(2x-8)+(b-4)
10) a*(m+n)-(p+an)
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Verified answer
1) 2*(a-9)-3=2a-2*9-3=2a-18-3=2a-21
2) -3*(x+2)+10 = -3x-3*2+10=-3x-6+10=-3x+4
3) 5*(4-x)-(-5x+1)= 5*4-5*x+5x-1=20-5x+5x-1=19
4) -3*(2x+5)+(15-a)=-3*2x-3*5+15-a=-6x-15+15-a=-6x-a
5) x*(a-b)-(c-bx)=xa-xb-c+bx=ax-c
6) -5*(m-1)+12= -5m+5+12=-5m+17
7) 3*(x-3)-9=3x-9-9=3x-18
8) 2*(7-x)-(4-2x)=14-2x-4+2x=10
9) -0,5*(2x-8)+(b-4)=-0.5*2x+0.5*8+b-4= -x+4+b-4= -x+b
10) a*(m+n)-(p+an)= am+an-p-an=am-p
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Answers & Comments
Verified answer
1) 2*(a-9)-3=2a-2*9-3=2a-18-3=2a-212) -3*(x+2)+10 = -3x-3*2+10=-3x-6+10=-3x+4
3) 5*(4-x)-(-5x+1)= 5*4-5*x+5x-1=20-5x+5x-1=19
4) -3*(2x+5)+(15-a)=-3*2x-3*5+15-a=-6x-15+15-a=-6x-a
5) x*(a-b)-(c-bx)=xa-xb-c+bx=ax-c
6) -5*(m-1)+12= -5m+5+12=-5m+17
7) 3*(x-3)-9=3x-9-9=3x-18
8) 2*(7-x)-(4-2x)=14-2x-4+2x=10
9) -0,5*(2x-8)+(b-4)=-0.5*2x+0.5*8+b-4= -x+4+b-4= -x+b
10) a*(m+n)-(p+an)= am+an-p-an=am-p