calculez et simplifier : A : -1/2x5/-7x14/15= B: 5x(-6/5+1/10)= C: 2/3-4/7:5/14= urgent svp
Mathématiques
paulinejuste2
Question
calculez et simplifier :
A : -1/2x5/-7x14/15=
B: 5x(-6/5+1/10)=
C: 2/3-4/7:5/14=
urgent svp
A : -1/2x5/-7x14/15=
B: 5x(-6/5+1/10)=
C: 2/3-4/7:5/14=
urgent svp
1 Réponse
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1. Réponse misout1
-1/2 x 5/-7 x 14/15
= -1 x 5 x 7 x 2 / -2 x 7 x 5 x 3
= 1/3
5 x (-6/5 +1/10)
= 5 x (-6 x 2 / 5 x 2 +1/10)
= 5 x (-12/10 +1/10)
= 5 x (-11/10)
= -5 x 11 / 1 x 5 x 2
= -11/2
2/3 -4/7 : 5/14
= 2/3 -4/7 x 14/5
= 2/3 -4 x 7 x 2 / 7 x 5
= 2/3 -8/5
= 2 x 5 / 3 x 5 -8 x 3 / 5 x 3
= 10/15 -24/15
= -14/15