a = x
b = 3x/8
Ob = 11
Ob = 2a + 2b
11 = 2x + 2(3x/8)
11 = 2x + 3x/4 /*4
44 = 8x + 3x
44 = 11x /:11
x = 4
spr:
a=4
b = 3x/8 = 3*4/8 = 12/8
11 = 2*4 + 2*12/8
11 = 8 + 24/8
11 = 8 + 3
11 = 11
boki prostokata to 4 i 12/8
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a = x
b = 3x/8
Ob = 11
Ob = 2a + 2b
11 = 2x + 2(3x/8)
11 = 2x + 3x/4 /*4
44 = 8x + 3x
44 = 11x /:11
x = 4
spr:
a=4
b = 3x/8 = 3*4/8 = 12/8
11 = 2*4 + 2*12/8
11 = 8 + 24/8
11 = 8 + 3
11 = 11
boki prostokata to 4 i 12/8