Advent Puzzles 2014: puzzle 7 solution

Most numbers have several solutions. One solution for each possible total is given below.

1=(12-4-7)\times1
2=1+12-4-7
3=7-1-(12\div4)
4=7-(12\div4\times1)
5=7+1-(12\div4)
6=12\div(7-1)+4
7=(12\times4+1)\div7
8=4+12-1-7
9=(4+12-7)\times1
10=1+4+12-7
11=12\div(4-1)+7
12=(7-1)\times4-12
13 \mbox{ cannot be made.}
14=7+12-1-4
15=(12-7)\times(4-1)
16=1+7+12-4
17=(7\times4)+1-12
18=(12\div4)\times(7-1)
19=(12-7)\times4-1
20=(12-7)\times4\times1
21=(12-7)\times4+1
22=4+7+12-1
23=(4+1)\times7-12
24=1+4+7+12

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