bonjour
A=3÷20-5÷4
A= 3/20-5/4
A=3/20-25/20
A=-22/20 réduit -11/10
B=(25÷12)×(16÷15)×(9÷4)
B=25/12×16/15×9/4
B=25×16×9/12×15×4
B=3600/720
B=5
C=(24÷21)÷(18÷14)
C=24/21÷18/14
C=24/21×14/18
C=24×14/21×18
C=336/378 réduit 8/9
D=(2÷7-1÷3)×7÷4-5÷4
D = (6/21-7/21)×7/4-5/4
D= -1/21×7/4-5/4
D= -7/84-5/4
D=-7/84-105/84
D = -112/84 réduit -4/3
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bonjour
A=3÷20-5÷4
A= 3/20-5/4
A=3/20-25/20
A=-22/20 réduit -11/10
B=(25÷12)×(16÷15)×(9÷4)
B=25/12×16/15×9/4
B=25×16×9/12×15×4
B=3600/720
B=5
C=(24÷21)÷(18÷14)
C=24/21÷18/14
C=24/21×14/18
C=24×14/21×18
C=336/378 réduit 8/9
D=(2÷7-1÷3)×7÷4-5÷4
D = (6/21-7/21)×7/4-5/4
D= -1/21×7/4-5/4
D= -7/84-5/4
D=-7/84-105/84
D = -112/84 réduit -4/3