Explications étape par étape:
A=1/3-1/3×4/7
=1/3-4/21
=7/21-4/21
=3/21
A=1/7
B=6/5:(1/15-1/5)
=6/5:(1/15-3/15)
=6/5:-2/15
=6/5×15/-2
=90/-10
B=-9
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Explications étape par étape:
A=1/3-1/3×4/7
=1/3-4/21
=7/21-4/21
=3/21
A=1/7
B=6/5:(1/15-1/5)
=6/5:(1/15-3/15)
=6/5:-2/15
=6/5×15/-2
=90/-10
B=-9