648720/68+506*108-63295=893
1)648720/68=9540
2)506*108=54648
3)9540+54648=64188
4)64188-63295=893
608*506-236*400+8716=2211964
1)608*506=307648
2)236*400=94400
3)307648-94400=213248
4)213248+8716=2211964
286996/(1010-553)+164268/324=1135
1010-553=457
286996:457=628
164268/324=507
507+628=1135
1000000-(700800+425*704)+25=25
425*704=299200700800+299200=10000001000000-1000000=00+25=25