ж) 12*(а+в)=12*а+12*в
з) (х+у)*15=х*15+у*15
и) а*(х+у)=а*х+а*у
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ж) 12*(а+в)=12*а+12*в
з) (х+у)*15=х*15+у*15
и) а*(х+у)=а*х+а*у