Răspuns:
a) [( 3/12+8/12)·(-6/11)+1/10:(-2/10)]:3/9=
[11/12·(-6/11)+1/10·(-10/2)]·9/3=
[(-1/2)+(-1/2)]·3=-2/2·3=-1·3=-3
b)-3/5=-9/15
-2/3=-10/15⇒-3/5∠-2/3
c) x-2/3=7/4
12x-8=21
12x=29
x=29/12=2,41(6)
Explicație pas cu pas:
