aire totale = [ ( 12 + 5) x 8 ] / 2 = 136/2 = 68 dam²
aire ADCM = [ (x + 5) x 8 ] / 2 = ( 8 x + 40 ) /2 = 4 x + 20
aire CMB = 68 - ( 4 x + 20 ) = 68 - 4 x - 20 = - 4 x + 48
1 ) 4 x + 20 = - 4 x + 48
4 x + 4 x = 48 - 20
8 x = 28
x = 3.5
4 x + 20 > - 4 x + 48
4 x + 4 x > 48 - 20
8 x > 28
x > 3.5
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aire totale = [ ( 12 + 5) x 8 ] / 2 = 136/2 = 68 dam²
aire ADCM = [ (x + 5) x 8 ] / 2 = ( 8 x + 40 ) /2 = 4 x + 20
aire CMB = 68 - ( 4 x + 20 ) = 68 - 4 x - 20 = - 4 x + 48
1 ) 4 x + 20 = - 4 x + 48
4 x + 4 x = 48 - 20
8 x = 28
x = 3.5
4 x + 20 > - 4 x + 48
4 x + 4 x > 48 - 20
8 x > 28
x > 3.5