4000×X=720000 X:9=36090
X=720000:4000 X=36090×9
X=180 X=324810
4000×180=720000 324810:9=36090
80000:X=1600
X=80000:1600
X=50
80000:50=16000
4000×X=720000 X:9=36090
X=720000:4000 X=36090×9
X=180 X=324810
4000×180=720000 324810:9=36090
80000:X=1600
X=80000:1600
X=50
80000:50=16000
Х=720000:4000 X=36090х9
X=180 X=324810
4000x180= 720000324810 :936090
80000:X=1600
Х=80000:1600
X=50
80000:50=16000