1.463348+67892=531240
2. 18*331=5958
3.531240/21=25297,1429
4. 5958-25297,1429=-19339,1429
5. -19339,1429/14=-1381,3674
6. 143*26=3718
7 .-1381,3674+3718=2336,6326.
2) 1. 400100-397964=2136
2. 2136*201=429336
3. 429336+5280=434616
4. 434616/24=18109
5. 18109-81154=-63045
3)
1. 7470/18=415
2. 415-319=96
3. 24*45=1080
4. 2060-1080=980
5. 980/28=35
6. 96+35=131