Question

Ex 12 !! Va rog urgentttt!!!

Answer 1

Răspuns:

a)

$\frac{1}{2} x + 0.3 = 1$

$\frac{1}{2} x = 1 - 0.3$

$\frac{1}{2} x = 0.7$

x = 1,4

b)

$\frac{1}{4} x - 1.5 = 2$

$\frac{1}{4} x = 2 + 1.5$

$\frac{1}{4} x = 3.5$

x = 14

c)

$\frac{3}{4} b - 2 = 4.3$

$\frac{3}{4} b = 4.3 + 2$

$\frac{3}{4} b = 6.3$

$b = 8.4$

d)

$7 - \frac{5}{2} x = 2.8$

$- \frac{5}{2} x = 2.8 - 7$

$- \frac{5}{2} x = - 4.2$

$\frac{5}{2} x = 4.2$

x = 1,68

e)

$\frac{1}{2} + 8y = 6$

$8y = 6 - 0.5$

8y = 5,5

y = 0,6875

f)

$3 = 5x - \frac{3}{2}$

$3 + 1.5 = 5x$

$5x = 4.5$

x = 0,9

g)

$\frac{7}{20} a - 1 = 27.7$

$\frac{7}{20} a = 27.7 + 1$

$\frac{7}{20} a = 28.7$

a = 82

h)

$8 - \frac{3}{4} m = 7.1$

$8 - 7.1 = \frac{3}{4} m$

$\frac{3}{4} m = 0.9$

m = 1,2