Răspuns:
Explicație pas cu pas:
ma(x,y,z) = 12.54
ma(x,y) = 3,31
x = y+2,31
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ma(x,y,z) = 12.54 <=> (x+y+z)/3 = 12,54 =>
x+y+z = 12,54·3 = 37,62 =>
ma(x,y) = 3,31 <=> (x+y)/2 = 3,31 =>
x+y = 3,31·2 = 6,62
6,62 +z = 37,62 => z = 37,62-6,62 => z = 31
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x+y = 6,62
x = y+2,31 =>
y+2,31+y = 6,62 =>
2y = 6,62-2,31 = 4,31 =>
y = 4,31:2 => y = 2,155
x = 2,155+2,31 => x = 4,465
x·y = 4,465·2,155 = > x·y = 9,622075
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