Question

a/ -(x+ 84)+ 213= -16

b/ (x- 345) - 476 = ( 975-761) - (315+x)

c/ x- (35-x) = 15-x

GIẢI GIÚP MÌNH VỚI MÌNH ĐANG CẦN GẤP!!!!

 

Answer 1

Trả lời :

a, - (x + 84) + 213 = - 16

=> - x - 84 + 213 = -16

=> - x + 129 = - 16

=> - x = - 145

=> x = 145

b, (x - 345) - 476 = (975 - 761) - (315 + x)

=> x - 345 - 476 = 214 - 315 - x

=> x - 821 = - 101 - x

=> x + x = - 101 + 821

=> 2x = 720

=> x = 360

c, x - (35 - x) = 15 - x

=> x - 35 + x = 15 - x

=x + x + x = 15 + 35

=> 3x = 50

=> x = \(\frac{50}{3}\)

Answer 2

a, \(-\left(x+84\right)+213=-16\Leftrightarrow-x-84=-229\Leftrightarrow x=145\)

b, \(\left(x-345\right)-476=\left(975-761\right)-\left(315+x\right)\)

\(\Leftrightarrow x-345-476=214-315-x\Leftrightarrow2x=720\Leftrightarrow x=360\)

c, \(x-\left(35-x\right)=15-x\Leftrightarrow x-35+x=15-x\Leftrightarrow x=50\)