10. Please use four 4s and arithmetic operators, parentheses to form five expressions, so that their results are equal to $5$, $6$, $7$, $8$, $9$ respectively.
10、 $(4 \times 4+4) \div 4=5, \quad 4+(4+4) \div 2=6, \quad 4+4-4 \div 4=7, \quad 4+4+4-4=8, \quad 4+4+4 \div 4=9$