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Sagot :

Réponse :

bonjour

Explications étape par étape

1)-175/-25=(-175÷5)/(-25÷5)=-35/-5=7

-38/114=(-38÷2)/(114÷2)=-19/57=(19x-1)/(19x3)=-1/3

1.21/-7.7=121/-770=(11x11)(70x11)=11/70

2)12/7+(-4)/7=8/7

12/7-(-4)/7=12/7+4/7=16/7

-5/2+1/4=(-5x2)/(2x2)+1/4=-10/4+1/4=-9/4

-5/2-1/4=-10/4-1/4=-11/4

-2/3+(-3)/4=(-2x4)/(3x4)+(-3x3)/(4x3)=-8/12+-9/12=-17/12

-2/3-(-3)/4=-2/3+3/4=-8/12+9/12=1/12

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