20450-20405+2145=2190
20450 2145
- -
20405 45
45 2190
38000+95*200-3700=53300
200 38000 57000
* + -
95 19000 3700
19000 57000 53300
570*32*50-4*400=910400
570 18240 400 912000
* * * *
32 50 4 1600
18240 912000 1600 910400
20450-20405+2145=2190
20450 2145
- -
20405 45
45 2190
38000+95*200-3700=53300
200 38000 57000
* + -
95 19000 3700
19000 57000 53300
570*32*50-4*400=910400
570 18240 400 912000
* * * *
32 50 4 1600
18240 912000 1600 910400