Réponses

2013-11-23T15:17:01+01:00
A) 7x(23+6)=7x23+7x6
b)(45-31)x5=45x5-31x5
c) 1,2x7+1,2x11=1,2x(7+11)
d) 3x1,4-3x0,8=(1,4-0,8)x3
2013-11-23T15:23:42+01:00
a. 7x(23+6)
=7x23+7x6
=161+42
=203

b.(45-31)x5
=45x5-31x5
=225-155
=70

c.1,2x7+1,2x11
=1.2x(7+11)
=8.4+13.2
=21.6

d. 3x1,4-3x0,8
=(1,4-0,8)x3
=4.2-2.4
=1.8