405
* 128
3240
+ 810
405
51840
283
* 560
1698
+1415
158480
209
* 306
1254
627
63954
507
* 406
3042
2028
205842
327
*108
2616
327
35316
438
*209
3942
876
91542
420*300-16800:600=
=125972
1) 420
* 300
126000
2) 16800/600=28
-1200
4800
-4800
0
3)126000
- 28
125972
5210*60+459200:800=
=313174
1) 5210
* 60
312600
2) 459200/800=574
-4000
5920
-5600
3200
-3200
0
3) 312600
+ 574
313174