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Sagot :

Bonjour,

1)

3/10  *(5/6 - 10/8)

= 3/10 * (40/48 - 60/48)

= 3/10 * (-20/48)

= 3/10 * (- 5/12)

= -15/ 120

= -3/24

2)

-3/16 * -5/2 = 15 /32

= (15/32 )/( -9/32)

= 15/32 * (-32/9)

= -15/9

= - 5/3

3)

20/24 - 42/24 + 3/24

= -19/24

AB =?

Pythagore

AB² = AH² + BH²

= 3²+ 2²

AB²= 9 + 4 = 13

AC² = AH² + HC²

= 3² + 4,5²

AC² = 9+20,25 =29,25

BC² = AB² + AC²

BC = 2+4,5 =  6,5

6,5² = 13 + 29,25

42,25  =   42,25

Le triangle est rectangle.

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