Question

Stiind ca a+b=8, aflati valoarea numarului X:

a) x+2a+2b=17

b) 75-x=5a+5b

c) X x a+X x b=24

d) 4x-3(a+b)=8.




Va rog sa ma ajutati.Multumesc.

Answer 1

a=8-b
x+2(8-b)+2b=17
x+16-2b+2b=17
x+16=17
x=1

Answer 2

X+2 (a+b)=17 X=1 B) 75-x=5 (a+b) 75-x=5*8 X=75-40=35 X (a+b)=24 X8=24 X=3 4x-3 (a+b)=8 4x-3*8=8 4x=8+3*8 4x=4×8 X=8