Question

aflați x : a) x-1 supra 4 = 1 supra 5
b)1 1 supra 4 * x=2supra3
c)x + 3 supra 4=7supra6
d)5 supra 3 -x=1supra4
e)12 1supra5+x=18 1supra3

Answer 1

a) (x-1)/4=1/5
5×(x-1)=1×4
5x-5=4
5x=4+5
x=9/5

b) 11/(4×x)=2/3
2×4x=3×11
8x=33
x=33/8

c) (x-3)/4=7/6
6×(x-3)=4×7
6x-18=28
6x=28+18
x=46/6 ( se simplifică cu "2")
x=23/3

d) 5/(3-x)=1/4
3-x=5×4
-x=20-3 | ×(-1)
x=17

e) 121/(5+x)=181/3
181×(5+x)=3×121
905+181x=363
181x=363-905
x= -542/181 sau -542:181