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daca a-2b=5 sa se afle x din relatiile: a)x+2a-4b=15 b)25a+x-50b=200 c)4a-8b-x=10
d)x+15+3a-6b=30

Urgent!!!!


Răspuns :

a) x + 2(a - 2b ) = 15
x + 2 × 5 = 15
x + 10 = 15
x = 5

b) x + 25(a - 2b) = 200
x + 25 × 5 = 200
x = 200 - 125
x = 75

c) 4(a - 2b) - x = 10
4×4 - x = 10
16 - x = 10
x = 16 - 10 = 6

d) x + 15 + 3(a - 2b) = 30
x + 3×5 = 30 - 15 = 15
x = 15 - 15 = 0