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Dorinedev
@Dorinedev
April 2019
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Justifier que les nombres A et B sont égaux
a) A= 3 racine carré de 80 et B= 4 racine carré de 45
b) A= 7 racine carré de 108 et B= 6 racine carré de 147
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nonotata
a) A= 3 racine carré de 80 et B= 4 racine carré de 45
a =3V80 =3 V16x5 =3V4²x5 = 3x4V5 =12V5
b =4V45= 4V9x5=4V3²x5 =4x3V5 = 12V5
donc a = b
b) A= 7 racine carré de 108 et B= 6 racine carré de 147
a =7V108 = V27x4 = 7V9x3x2² = 7V3²x3x2² = 7x3x2V3=42V3
B = 6V147 = 6V49x3 =6V7²x3 = 6x7V3 = 42V3
donc a =b
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a =3V80 =3 V16x5 =3V4²x5 = 3x4V5 =12V5
b =4V45= 4V9x5=4V3²x5 =4x3V5 = 12V5
donc a = b
b) A= 7 racine carré de 108 et B= 6 racine carré de 147
a =7V108 = V27x4 = 7V9x3x2² = 7V3²x3x2² = 7x3x2V3=42V3
B = 6V147 = 6V49x3 =6V7²x3 = 6x7V3 = 42V3
donc a =b