46.
60+24=84 35+12=47 57+13=70
45+55=100 302+200=502 134+400=534
200+687=887 132+450=582 649+101=750
606+160=766 3070+105=3175 6009+1001=7010
47.
(725+48)+809=1582
1) 725+48=773
2) 773+809=1582
725+(48+809)=1534
1) 48+809=857
2) 725+809=1534
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46.
60+24=84 35+12=47 57+13=70
45+55=100 302+200=502 134+400=534
200+687=887 132+450=582 649+101=750
606+160=766 3070+105=3175 6009+1001=7010
47.
(725+48)+809=1582
1) 725+48=773
2) 773+809=1582
725+(48+809)=1534
1) 48+809=857
2) 725+809=1534