Răspuns :
x=30/7
x=4,2
x=420/60
x=7
y=490/7
y=60
y=432/8
y=54
z=900-250
z=650
z=825-600
z=125
X x 30=7 X=30/7
420:x=60 x=420:60=7
7xy=490 y=490:7=70
yx8=432 y=432:8=54
z+250=900 z=900-250=650
825-z=600 825-600=z z=225
x=30/7
x=4,2
x=420/60
x=7
y=490/7
y=60
y=432/8
y=54
z=900-250
z=650
z=825-600
z=125
X x 30=7 X=30/7
420:x=60 x=420:60=7
7xy=490 y=490:7=70
yx8=432 y=432:8=54
z+250=900 z=900-250=650
825-z=600 825-600=z z=225