Bonjour,
Calculer:
10/7 - 2/5(3/6)= 10/7 - 2/5(1/2)= 10/7-(2x1)/(5x2)= 10/7- 2/10= 10/7-1/5
= (10x5-1x7)/(7x5)= (50-7)/35= 43/35)
Développer:
5x(3x+2)= 15x²+10x
Pour x= 4
10x²-7x+9= 140
10(4)²-7(4)+9= 141
10(16)-28+9= 141
160-19= 141
141 = 141 vrai
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Bonjour,
Calculer:
10/7 - 2/5(3/6)= 10/7 - 2/5(1/2)= 10/7-(2x1)/(5x2)= 10/7- 2/10= 10/7-1/5
= (10x5-1x7)/(7x5)= (50-7)/35= 43/35)
Développer:
5x(3x+2)= 15x²+10x
Pour x= 4
10x²-7x+9= 140
10(4)²-7(4)+9= 141
10(16)-28+9= 141
160-19= 141
141 = 141 vrai