ПОМОГИТЕ СРОЧНО!!! Вычислите рациональным способом:1) 8,3×7+4,5×7+1,7×7+5,5×7
2) 0,85×4+0,73×5+0,15×4+0,27×5
3)5,25×2+6,31×3+2×0,75+3×0,69
ДАМ 20 БАЛЛОВ
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