2∧log2 1/4+(16/9)∧-1/3+lg20-lg2

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2∧log21/4+(16/9)∧-1/3+lg20-lg22∧log21/4+(16/9)∧-1/3+lg20-lg22∧log21/4+(16/9)∧-1/3+lg20-lg22∧log21/4+

2∧log2 1/4+(16/9)∧-1/3+lg20-lg2
2∧log2 1/4+(16/9)∧-1/3+lg20-lg2

2∧log2 1/4+(16/9)∧-1/3+lg20-lg2
2∧log2 1/4+(16/9)∧-1/2+lg20-lg2 那儿不是^1/3而是1/2
=1/4 +(9/16)^(1/2)+lg(20÷2)
=1/4+3/4+lg10
=1+1
=2