wstaw nawiasy na 3 rozne sposoby tak aby otrzymac 3 rozne wyniki 20 20+3*4+7*5= 20+3*4+7*5=
20+(3*4)+(7*5)
(20+3)*(4+7*5)=23*39=667
20+(3*4+7)*5= 20+19*5= 115
(20+3*4)+7*5=(20+12)+35= 32+35=67
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20+(3*4)+(7*5)
(20+3)*(4+7*5)=23*39=667
20+(3*4+7)*5= 20+19*5= 115
(20+3*4)+7*5=(20+12)+35= 32+35=67