Réponses

2014-03-02T16:04:23+01:00
A= -12/25  × 5/16 + 3/8 
= -60/400 + 3/8
= -6/40 + 3/8
= -3/20 + 3/8
= -6/40 + 15/40 = 9/40

B= -4/15 + 3/8 ÷ -5 / 4

= - 4/15 + 3/8 * -4/5
= -4/15 + -12/40
= - 4/15 - 12/40
= -32/120 - 36/120
= -68/120 = - 34/60 = -17/30

C= ( 3/4 + 1/6 ) ÷ ( 9/10 -1 ) 
= (9/12 + 2/12) / (9/10-10/10)
= 11/12 : 1/10
= 11/12 * 10
= 110/12 = 55/6

D = (-1 + 1/6) / (-1 - 1/6)
= (-1)² - (1/6)²
= 1 - 1/36
= 36/36 - 1/36
= 35/36