* や / を使った回答例です。
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 * 9 = 100
1 * 2 * 3 * 4 + 5 + 6 - 7 + 8 * 9 = 100
1 + 2 * 3 + 4 * 5 - 6 + 7 + 8 * 9 = 100
1 * 2 * 3 * 4 + 5 + 6 + 7 * 8 + 9 = 100
1 - 2 + 3 * 4 * 5 + 6 * 7 + 8 - 9 = 100
1 + 2 + 3 - 4 * 5 + 6 * 7 + 8 * 9 = 100
1 + 2 - 3 * 4 + 5 * 6 + 7 + 8 * 9 = 100
1 - 2 * 3 - 4 + 5 * 6 + 7 + 8 * 9 = 100
1 - 2 * 3 + 4 * 5 + 6 + 7 + 8 * 9 = 100
1 + 2 * 3 + 4 * 5 - 6 + 7 + 8 * 9 = 100
1 * 234 + 5 - 67 - 8 * 9 = 100
1 * 2 + 3 + 45 + 67 - 8 - 9 = 100
1 * 2 + 34 + 56 + 7 - 8 + 9 = 100
1 * 23 + 4 + 5 + 67 - 8 + 9 = 100
1 * 23 - 4 + 5 - 6 - 7 + 89 = 100
12 + 34 - 5 - 6 - 7 + 8 * 9 = 100
12 + 34 + 5 * 6 + 7 + 8 + 9 = 100
123 + 4 * 5 - 6 * 7 + 8 - 9 = 100
1 * 2 * 3 * 4 - 5 - 6 + 78 + 9 = 100
1 + 2 * 3 + 4 + 5 + 67 + 8 + 9 = 100
1 * 2 * 3 - 4 + 5 + 6 + 78 + 9 = 100
1 - 2 - 3 + 45 - 6 - 7 + 8 * 9 = 100
1 + 23 - 4 - 5 + 6 + 7 + 8 * 9 = 100
12 - 3 - 4 + 5 * 6 + 7 * 8 + 9 = 100
12 * 3 - 4 - 5 - 6 + 7 + 8 * 9 = 100
12 + 3 * 4 + 5 + 6 + 7 * 8 + 9 = 100
-1 + 2 - 3 + 4 + 5 + 6 + 78 + 9 = 100
-1 * 2 - 3 - 4 - 5 + 6 * 7 + 8 * 9 = 100
-1 + 2 + 3 + 4 * 5 * 6 - 7 - 8 - 9 = 100
-1 + 2 * 3 * 4 + 5 * 6 + 7 * 8 - 9 = 100
-1 * 2 + 3 + 4 + 5 * 6 + 7 * 8 + 9 = 100
-1 * 2 - 3 + 4 * 5 + 6 + 7 + 8 * 9 = 100
-1 + 23 * 4 - 5 + 6 + 7 - 8 + 9 = 100
-12 * 3 - 4 * 5 + 67 + 89 = 100
1 + 2 * 3 * 4 * 5 / 6 + 7 + 8 * 9 = 100
1 * 2 - 3 + 4 + 56 / 7 + 89 = 100
1 + 2 * 3 - 4 + 56 / 7 + 89 = 100
1 + 23 * 4 + 56 / 7 + 8 - 9 = 100
1 + 23 - 4 + 56 / 7 + 8 * 9 = 100
1 + 234 * 5 / 6 - 7 - 89 = 100
12 / 3 / 4 * 5 * 6 + 78 - 9 = 100
12 / 3 + 4 * 5 * 6 - 7 - 8 - 9 = 100
( 123 - 45 ) / 6 + 78 + 9 = 100
( 12 - 3 - 4 ) * 5 + 6 + 78 - 9 = 100
( 1 + 2 ) * 3 - 4 + 5 - 6 + 7 + 89 = 100
( 1 + 2 + 3 + 4 ) * 5 + 67 - 8 - 9 = 100
1 * ( 2 + 3 ) * 4 * 5 + 6 - 7 - 8 + 9 = 100
( 1 * 2 + 3 ) * 4 * 5 + 6 - 7 - 8 + 9 = 100
( 1 + 2 + 3 + 4 + 5 ) * 6 - 7 + 8 + 9 = 100
( 1 / 2 + 3 ) * 4 * 5 + 6 + 7 + 8 + 9 = 100
( 1 + 2 * 3 - 4 ) * 5 * 6 - 7 + 8 + 9 = 100
( 1 + 2 ) / 3 * 4 * ( 56 / 7 + 8 + 9 ) = 100
( 1 - 2 + 3 ) * ( 4 * 5 + 6 + 7 + 8 + 9 = 100
( 1 * 2 + 3 * 4 ) * 5 + ( 6 + 7 + 8 + 9 ) = 100
( 1 + 2 + 3 + 4 ) * ( 5 + 6 ) + 7 - 8 - 9 = 100
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