Вычислите сумму, используя свойства сложения а)1,2+2,3+3,4+4,5+5,6+6,7+7,8=
б)2,3+3,4+4,5+5,6+6,7+7,8+8,5+9,2=
в)1,7+3,3+7,72+3,28+1,11+8,89=
г)18,8+19+12,2+11,4+0,6+11=
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