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빈 칸에 알맞은 수를 넣으세요.
1
13 + 15 × 13 - 9 × 3 = 13 +195 -9 ×3 = 13 +195 -27 = 208 -27 = 181 2
15 × 13 + 15 - 12 - 14 =+-- =-- =- = 3
15 × 3 - 2 + 14 - 5 =-+- =+- =- = 4
12 × 2 - 12 - 8 + 9 =--+ =-+ =+ = 5
12 × 2 + 2 - 8 + 9 =+-+ =-+ =+ = 6
8 + 13 × 8 + 11 - 3 =++- =+- =- = 7
9 × 3 - 8 + 2 - 11 =-+- =+- =- = 8
10 - 4 + 7 + 10 × 3 =-++ =++ =+ = |