1.2.7.7四个数用加减乘除算24

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1.2.7.7四个数用加减乘除算241.2.7.7四个数用加减乘除算241.2.7.7四个数用加减乘除算241:(7×7-1)÷22:((7×7)-1)÷2(7×7-1)÷2=24[1+2+(7/7)

1.2.7.7四个数用加减乘除算24
1.2.7.7四个数用加减乘除算24

1.2.7.7四个数用加减乘除算24
1:(7 × 7 - 1) ÷ 2
2:((7 × 7) - 1) ÷ 2

(7 × 7 - 1) ÷ 2 =24
[1+2+(7/7)]!

((7 × 7) - 1) ÷ 2

1, 2, 7, 7的24点答案:
1: (7 × 7 - 1) ÷ 2
2: ((7 × 7) - 1) ÷ 2