Correct option is B
Given:
From option (A): interchanging ÷and -
18 × 6 + 12 ÷ 7 - 2=1
18 × 6 + 1.71 - 2=1
108 + 1.71 - 2=1
109.71 - 2=1
107.71≠1
This equation is incorrect.
From option (B): interchanging × and ÷
18 ÷ 6 + 12 - 7 × 2 = 1
3 + 12 - 7 × 2 =1
3 + 12 - 14 =1
15-14=1
1=1
This equation is correct.
From option (C): interchanging + and ×
18 + 6 × 12 - 7 ÷ 2 = 1
18 + 6 × 12 - 3.5 = 1
18 + 72 - 3.5 =1
90 - 3.5 = 1
86.5 ≠1
This equation is incorrect.
From option (D): interchanging - and +
18 × 6 - 12 + 7 ÷ 2 = 1
18 × 6 - 12 + 3.5 =1
108 - 12 + 3.5 = 1
111.5 - 12 = 1
99.5 ≠ 1
This equation is incorrect.
Thus, Option B is the correct answer.
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