Раскройте скобки и решите:
а) 4y-(3y-(2y+1))
б) a-(2x-(2a-x))
в) 3m-(3m+(3m-(m+3)))
г) b-(2c-(3b+(4c-5b)))
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Раскройте скобки и решите:
а) 4y-(3y-(2y+1))
б) a-(2x-(2a-x))
в) 3m-(3m+(3m-(m+3)))
г) b-(2c-(3b+(4c-5b)))
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Answers & Comments
а) 4y-(3y-2y-1)=4y-3y+2y+1=3y+1
б) a-(2x-2a+x)=a-2x+2a-x=3a-3x
в) 3m-(3m+(3m-m-3))= 3m-(3m+3m-m-3)=3m-3m-3m+m+3=-2m+3
г) b-(2c-(3b+4c-5b))=b-(2c-3b-4c+5b)=b-2c+3b+4c-5b=-b+2c
a)4y-(3y-(2y+1))=
4y-3y+2y+1=
5y=1
y=1/5
б) a-(2x-(2a-x))=
a-2x+2a-x=a-3x
в) 3m-(3m+(3m-(m+3)))=
3m-3m-3m+m+3=
-2m=-3
m=3/2
г)b-(2c-(3b+(4c-5b)))=
b-2c+3b+4c-5b=
2c-b