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A =-1/5 +10/21 X 7/5

 

B =65/98 X 26/-21

 

C =25/16 X 49/-75 X -32/56 X(-10)

Répondre :

A =-1/5 +10/21 X 7/5

    =-1/5+70/105

    =-1/5+2/3

    =-3/15+10/15

    =7/15

 

B =65/98 X 26/-21

    =(5*13*2*13)/(-7*7*2*7*3)

    =-845/1029

 

C =25/16 X 49/-75 X -32/56 X(-10)

    =(5*5*7*7*16*2*10)/(4*4*25*3*7*8)

    =35/6

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