Question

[Nguyễn Hà Anh]

Câu 1 : đơn giản biểu thức 

  1 .( x + 1982 + 172 ) + (- 1982 ) -162

   2 . 2x - [(a + b - c ) -( x + a - 2 )] + ( 2b + c -3 )

   3 . 235 + x - ( 65 + x ) + x

   4 . ( a + b +1 ) - ( a - c + 1 ) - ( b + c )

   5 . a - ( b + c - d ) + ( - d ) - a

   6 . ( a + b - c - 2019 ) - ( c - b + a - 2020 ) + c

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Answer 1

[Nguyễn Huy Tú]

a, \(\left(x+1982+172\right)+\left(-1982\right)-162\)

\(=x+1982+172-1982-162=x+10\)

b, \(2x-\left[\left(x+b-c\right)-\left(x+a-2\right)\right]+\left(2b+c-3\right)\)

\(=2x-\left(x+b-c-x-a+2\right)+2b+c-3\)

\(=2x-\left(-a+b-c+2\right)+2b+c-3\)

\(=2x+a-b+c-2+2b+c-3=2x+a+b+2c-5\)

c, \(235+x-\left(65+x\right)+x=235+x-65-x+x=170+x\)

d, \(\left(a+b+1\right)-\left(a-c+1\right)-\left(b+c\right)\)

\(=a+b+1-a+c-1-b-c=0\)

e, \(a-\left(b+c-d\right)+\left(-d\right)-a=a-b-c+d-d-a=-b-c\)

f, \(\left(a+b-c-2019\right)-\left(c-b+a-2020\right)+c\)

\(=a+b-c-2019-c+b-a+2020+c=2b+1\)

Answer 2

[Nguyễn Gia Bảo]

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