3^2-50÷2^2×1/10-1

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3^2-50÷2^2×1/10-1
3^2-50÷2^2×1/10-1

3^2-50÷2^2×1/10-1
3^2-50÷2^2×1/10-1
= 9- 50 ×1/10÷4 -1
= 9- 5/4-1
= 6又3/4