Wstaw nawiasy na 3 różne sposoby, tak aby otrzymać 3 różne wyniki.20+3x4+7x5=20+3x4+7x5=20+3x4+7x5=
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(20+3)x4+7x5=23x4+7x5=92+35=127
20+3x(4+7)x5=23x11x5=1265
20+3*4+(7*5)
20+3*(4+7)*5