Question

a)0,2*[*(x-0,2)-0,2]-0,2=0,2
b)[1supra2+(0,4+x)*0,2]:0,7=1
DAU COROANĂ !!!

Answer 1

Răspuns:

a)

0,2 = 2/10 = 1/5

1/5 • (x - 2/5) - 1/5 = 1/5

1/5 • (x - 2/5) = 2/5

x - 2/5 = 2/5 • 5

x - 2/5 = 2

x = 2 + 2/5

x = 7/5

b)

0,4 = 4/10 = 2/5

[1/2 + (2/5 + x) • 1/5] • 10/7 = 1

1/2 + (2/5 + x) • 1/5 = 7/10

(2/5 + x) • 1/5 = 7/10 - 1/2

(2/5 + x) • 1/5 = 1/5

2/5 + x = 1

x = 1 - 2/5

x = 3/5