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Verified answer

1 ц 2/9=(9+2)/9=11/9
1ц 1/6=(6+1)/6=7/6
2=2*42/42=84/42
1ц 25/42=(42+25)/42=67/42

1)11/9+7/6=(11*2+7*3)/18=(22+21)/18=43/18
2)84/42-67/42=(84-67)/42=17/42
3)43/18*17/42=(43*17)/(18*42)=731/756

43. 18
17. 42
301. 36
43. 72
731. 756