831. Вычислите рациональным способом:
1) (0.9.5 +5.0.6)-(0.7.2 +3.0,7);
2) (13.2.5 - 2,5.9) +(8.5.6 - 3,1.8);
3) (3,61.7 +7.0.13) - (2,26.4 +3.2.26).​
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