Réponses

2013-11-29T19:31:05+01:00
1) x=3
7(3)=21

2) y=1,5
4(1,5)+5=6+5=11

3) z=4
3(2(4)+1)=3(8+1)=3(9)=27
2013-11-29T19:41:01+01:00
1) 7 x 3 = 21

2) 4 x 1,5 + 5 = 6 + 5 = 11

3) 3 x ( 2 x 4 + 1 ) = 3 x ( 8 + 1 ) = 3 x 9 = 27