Question

[Phượng Phạm]

tìm số nguyên x, biết:

giúp tớ nhé

Answer 1

[Nguyễn Lê Phước Thịnh]

a: 461+(x-45)=387

=>\(x-45=387-461=-74\)

=>\(x=-74+45=-29\)

b: \(15\cdot23-85\cdot23+\left|x-1\right|=2200\)

=>\(23\cdot\left(15-85\right)+\left|x-1\right|=2200\)

=>\(23\cdot\left(-70\right)+\left|x-1\right|=2200\)

=>\(\left|x-1\right|=2200+23\cdot70=3810\)

=>\(\left[{}\begin{matrix}x-1=3810\\x-1=-3810\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3811\\x=-3809\end{matrix}\right.\)

c: \(11-\left(-53+x\right)=97\)

=>\(11+53-x=97\)

=>64-x=97

=>x=64-97=-33

d: \(-\left|x-\left(-4\right)\right|=-9\)

=>\(\left|x-\left(-4\right)\right|=9\)

=>\(\left|x+4\right|=9\)

=>\(\left[{}\begin{matrix}x+4=9\\x+4=-9\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-13\end{matrix}\right.\)

e: \(-\left(x+84\right)+213=-16\)

=>\(213-x-84=-16\)

=>\(129-x=-16\)

=>x=129+16=145

f: \(-\left(15-x\right)=2^5:2^3\)

=>\(x-15=2^2=4\)

=>x=4+15=19

Answer 2

[Vui lòng để tên hiển thị]

`a, 461+(x-45)=387`

`<=> x-45=461-387`

`<=> x-45=74`

`<=> x=74+45=119`.

Vậy `x=119.`

`b, 15.23-85.23+|x-1|=2200`

`<=> 23.(15-85)+|x-1|=2200`

`<=> 23.(-60)+|x-1|=2200`

`<=> |x-1|=3580`

`<=> x=3581` hoặc `x=-3579.`