3. Вычислите: -9,8+9,8+12,7 –(-12,7)      1) 25,4;   2) 0;   3).-25,4;   4) 45.


4. Вычислите: -(-3,5).                   1) -16,2;   2) 16,2;   3) 9,2;   4) -9,2​
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