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빈 칸에 알맞은 수를 넣으세요.
1
2 × 15 + 14 × 4 - 9 = 30 +14 ×4 -9 = 30 +56 -9 = 86 -9 = 77 2
4 + 8 × 5 - 11 + 7 =+-+ =-+ =+ = 3
8 × 10 + 7 + 3 - 6 =++- =+- =- = 4
6 + 8 + 14 × 10 - 15 =++- =+- =- = 5
6 + 4 × 9 - 7 × 5 =+-× =+- =- = 6
13 + 3 × 4 - 4 - 13 =+-- =-- =- = 7
10 + 6 - 14 + 13 × 6 =+-+ =-+ =+ = 8
5 × 8 + 15 - 9 - 2 =+-- =-- =- = |