Question

Tìm số nguyên  x:

a) \(11-\left(15-49\right)=-x+(9-25)\)

b) \(x-+\left(-479-479\right)=-\left(26-74\right)\)

c) \(-\left(1930+2020\right)-x=\left(-96\right)+\left(-134\right)\)

Answer 1

\(11-\left(15-49\right)=-x+\left(9-25\right)\)

\(11-15+49=-x+9-25\)

\(x=9-25-11+15-49\)

\(x=-61\)

Vậy \(x=-61\)

Answer 2

\(x-+\left(-479-479\right)=-\left(26-74\right)\)

\(x+479+479=-26+74\)

\(x=74-26-479-479\)

\(x=-910\)

Vậy \(x=-910\)

Answer 3

\(-\left(1930+2020\right)-x=\left(-96\right)+\left(-134\right)\)

\(x=-3950+96+134\)

\(x=-3722\)

Vậy \(x=-3722\)