Question

Giúp em với ạ. Em xin cảm ơn rất nhiều!!

Answer 1

  

Answer 2

1.

\(a.-5x+20=5.3^2\)

\(-5x+20=5.9\)

\(-5x+20=45\)

\(-5x=45-20\)

\(-5x=25\)

\(x=25:\left(-5\right)\)

\(x=-5\)

 

b,\(36:\left(2x-15\right)=-12\)

\(2x-15=36:\left(-12\right)\)

\(2x-15=-3\)

\(2x=-3+15\)

\(2x=12\)

\(x=12:2\)

\(x=6\)

Answer 3

\(x\in N;150⋮x;120⋮x;x\) lớn nhất

\(=>x=ƯCLN\left(150,120\right)\)

Ta có: \(150=2.3.5^2\)

\(120=2^3.3.5\)

\(=>ƯCLN\left(150,120\right)=2.3.5=30\)

\(=>x=30\)