Question

a) (13x X-416:4):7=13 b) (123x X-1278):149=36
c) 6-5:[4-3:2(2-2:x)]=1
Ma ajuta cineva :)

Answer 1

a)(13x-416:4):6=13
(13x-104):6=13
13x-104=13•6
13x=78+108
13x=182
x=14

b)(123x-1278):149=36
123x-1278=36•149
123x-1278=5364
123x=5364+1278
123x=6642
x=54

c)6-5:[4-3:2(2-2:x)]=1
-5:[(4-3:(2•2+2•2/x)]=1-6
-5:[4-3/(4+4/x)]=-5
1:(4-3/(4x+4/x))=-5
1:(4-3x/(4x+4)=-5
1:[(4(4x+4)-3x)/(4x+4)=1
1:(16x+16-3x)/(4x+4)=1
(13x+16)/(4x+4)=1
(4x+4)/(13x+16)=1
(4x+4)=(13x+16)
4x+4=13x+16
4x-13x=16-4
-9x=11
x=-9/11