Question

a) 426-(460-10×a)=366
b) [(58×a-80)÷25]×64=1280
c) [(a+54)×4+6]×4-184=800
Vă rog!!

Answer 1

426-(460-10a)=366=>-460-10a=366-426=>-460-10a=-160|:(-1)=>460+10a=160=>10a=160-460=>10a=-300=>a=-300/10=>a=-30

Answer 2

a) -(460-10xa)=336-426
-(460-10xa)= -90 / : -1
460-10xa=90
-10xa=90-460
-10xa=-370 / :-1
10xa=370 => a=37
b) [(58xa-80):25]=1280:64
(58xa-80):25=20
58xa-80=20x25
58xa-80=500
58xa=500+80
58xa=580 => a=10
c) [(a+54)x4+6]x4=800+184
[(a+54)x4+6]x4=984
(a+54)x4+6=984:4
(a+54)x4+6=246
(a+54)x4=246-6
(a+54)x4=240
a+54=240:4
a+54=60 => a=6