4、In $10 \square 10 \square 10 \square 10 \square 10$, fill in the four blanks with the operation symbols “+” “-” “ $\times$ ” “ $\div$ ” each once, the maximum value of the resulting expression is ( ).
(A) 104
(B) 109
(C) 114
(D) 110
Analysis: $10 \times 10+10-10 \div 10=109$
In this problem, to achieve the maximum, minimize the use of division and subtraction, and maximize the use of addition and multiplication. Since we cannot make $(10+10) \times 2$, we can only do $10 \times 10+10$. So, is subtracting 10 the smallest? Actually, $10 \div 10=1$ is the smallest.