Réponses

2013-12-29T11:22:25+01:00
A = -10 - 2 x (-7) + 45 ÷ (-9)
A = -10 + 14 - 5
A = -15 +14
A = -1.

B = 21 + 5 x (3-7)
B = 21 + 5 x (-4)
B = 21 - 20
B = 1.
2013-12-29T11:55:41+01:00
A= -10-2x(-7)+45÷(-9) 
=-10+14+45 : (-9)
=4+ (-5)
=-1

B=21+5x(3-7) 
=21+5x(-4)
=21-20
=1