2) а-b+c,при а=2/7,-b=1/6,6=1/9.
2/7✓(54)-1/6✓(63)+1/9✓42=108-63+42/378=87/378=9
1/378.
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2) 2/7-1/6+1/9=12/42-7/42+1/9=5/42+1/9=15/126-14/126=1/126.
2) а-b+c,при а=2/7,-b=1/6,6=1/9.
2/7✓(54)-1/6✓(63)+1/9✓42=108-63+42/378=87/378=9
1/378.