Question

1) (-1005).(x cong 2 ) bang 0

2)  x cong x cong x cong 91 bang -2

3) / 5x cong 1/ bang 11

( thong cam nha , may mik k viet dc dau cong vs bang )

mik dg gap , giup mik nhe !

Answer 1

BÀI \(1\):

\(\left(-1005\right).\left(x+2\right)=0\)

\(x+2=0:\left(-1005\right)\)

\(x+2=0\)

\(x=0-2\)

\(x=-2\)

BÀI \(2\):

\(x+x+x+91=-2\)

\(3x=\left(-2\right)-91\)

\(3x=-93\)

\(x=\left(-93\right):3\)

\(x=-31\)

BÀI \(3\):

\(\left|5x+1\right|=11\)

Có hai trường hợp:

\(TH^{ }1:_{ }5x+1=11\)

\(5x=11-1\)

\(5x=10\)

\(x=10:5\)

\(x=2\)

\(TH2:^{ }5x+1=-11\)

\(5x=\left(-11\right)-1\)

\(5x=-12\)

\(x=\left(-12\right):5\)

\(x=-2,4\)

\(k\)\(minh\)\(nhe\)\(.\)