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(1 2\3)^ -9 ÷(1 2\3) ^ -7=(5\3) ^ -9 ÷(5\30 ^ -7 =(5\3)-² =3\5² =9\25
c)2 ^-10 ÷ (2^ -6*2^ -4)=2 ^ -10÷ 2^ -10=2^ 0=1
20)
{4\3 -²]² ÷(4\3) ^ -4 =4\3^ -4 ÷ (4\3) 6 -4=4\3^0=1
(1 5\7)-³*(7\12)-³(12\7)-³ *(7\12)-³ =12\7-³ *12\7³=12\7^0=1