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datos:
L= 0.68m
P= 222cm pasando el perímetro a m
222cm*(1m/100cm)= 2.22m
sabemos que tenemos que la fórmula del perímetro es
P= 2largo+2ancho
sustituyendo valores
2.22=2 (0.68)+2 (ancho)
2.22=1.36+2ancho
2.22-1.36=2ancho
0.86=2ancho
0.86/2=ancho
0.43=ancho
P= 2a+2L
2a+2L= P
2a= P-2L
a= ( P -2L) /2
a= 2.22-2(0.68)/2= 0.86/2= 0.43