Question

Rút gọn biểu thức 
a) 2x+(-81)-(24-81)
b)(-9-x+2)+9
c)66-(12-x)+(12-66)
d)15-(15-x+93)+93

Answer 1

a: \(=2x-81-24+81=2x-24\)

b: \(=-7-x+9=-x\)

c: \(=66-12+x+12-66=x\)

d: \(=15-15+x-93+93=x\)

Answer 2

a) 2x+(-81)-(24-81)

\(=2x-81-24+81=2x-24\)
b)(-9-x+2)+9

\(=9-9-x+2=2-x\)
c)66-(12-x)+(12-66)

\(=66-12+x+12-66=x\)
d)15-(15-x+93)+93

\(=15-15+x-93+93=x\)