September 2021 0 12 Report
используя сочетательный закон сложения для натуральных чисел , проверьте равенство : а) ( 3/4 + 1/6 ) + 7/12 = 3/4 + ( 1/6 + 7/12 ); б) 7/15 + ( 2/9+ 5/6 ) = (7/15 + 2/9 ) + 5/6
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