719. УПРОСТИТЕ ВЫРАЖЕНИЯ
1) -8.9 + (-1.9)
2) -(2.4 - а) - 10.4
3) -(-5.5 - b)
4) -13.8 - (с+20.2)
720. Упростите Выражения
1) -8.4 + а + b - 9.6
4) -61 2/9 - к + т - 68 1/6
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