P<sub>1</sub>=ж<sub>1</sub>f<sub>1</sub>, P<sub>2</sub>=ж<sub>2</sub>f<sub>2</sub>, P<sub>3</sub>=ж<sub>3</sub>f<sub>3</sub>, | P<sub>1</sub>=ж<sub>1</sub>f<sub>1</sub>, P<sub>2</sub>=ж<sub>2</sub>f<sub>2</sub>, P<sub>3</sub>=ж<sub>3</sub>f<sub>3</sub>, |