90¹ - 9²
90 - (9 × 9)
90 - 81
9
3²
(90 × 1) - (9 × 9)
9.
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90¹ - 9²
90 - (9 × 9)
90 - 81
9
3²
Penyelesaian :
90¹ - 9²
(90 × 1) - (9 × 9)
90 - 81
9.