b)10 zile...........170,1 t
7 zile..............x t
__________________
10x X=170,1x7
10X=1190,7
X=1190,7:10
X=119,07 t
16)
L=125,24
l=125,24:4
l=31,31
P=(2x125,24)+(2x31,31)
P=250,48+62,62
P=313,1
17)
3 zile..............45,72 km
1 zi....................X km
______________________
3X=45,72
X=45,72:3
X=15,24 km/zi
18)
16,75kg....................53,60 lei
1 kg..........................X lei
____________________
16,75 x X=53,60
X=53,60:16,75
X=3,20 lei
19)
0,ab:0,0c=a a/9
transformam in fractie si introducem intregii
ab/100:0c/100=(9a+a)/9
ab/100 inmultim cu inversa luic/100(asase procedeaza la impartirea fractiilor)
ab/100x100/c=10a/9
simplificam si obtinem
ab/c=10a/9 =>c=9
ab=10a
(nu sunt sigura de acest exercitiu...)
