Question

Tìm x:

a) 311 - x + 82 =46 + (x-21)

b)  (-x + 821 + 534) = 499 + (x - 84)

c) -(x -3 + 85) =( x + 70 -71 ) - 5

LÀM NHANH GÚP MK NHA

Answer 1

\(311-x+82=46\left(x-21\right)\)

<=> \(311+82-46+21=x+x\)

<=> \(2x=368\)

<=> \(x=184\)

\(-x+821+534=499+x-84\)

<=> \(-x-x=499-84-821-534\)

<=> \(-2x=-940\)

<=> \(x=470\)

\(-\left(x-3+85\right)=x+70-71-5\)

<=> \(-x+3-85=x-6\)

<=> \(-x-x=-6-3+85\)

<=> \(-2x=76\)

<=> \(x=-38\)

Answer 2

$311-x+82=46\left(x-21\right)$

<=> $311+82-46+21=x+x$

<=> $2x=368$

<=> $x=184$

$-x+821+534=499+x-84$

<=> $-x-x=499-84-821-534$

<=> $-2x=-940$

<=> $x=470$

$-\left(x-3+85\right)=x+70-71-5$

<=> $-x+3-85=x-6$

<=> $-x-x=-6-3+85$

<=> $-2x=76$

<=> $x=-38$