d=3-20sur21 * 7sur5=

f=1sur45/4sur9+7sur3=

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Grade: Education Subject: mathematiques

d=3-20sur21 * 7sur5=

f=1sur45/4sur9+7sur3=

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Answer (56)

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(148)
d=3-20/21 * 7/5= -17/21 * 7/5 = -119/105 = -17/15

f=1/45 :4/9+7/3= 1/45 * 9/4 + 7/3 =9/180 + 7/3 = 143/60