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1. (a) 4^2 × 5^2 (b) 2^3 × 3^2 (c) -1/10^3
2. (a) (1/11)^3 (b) 6^2 (c) 7/2 (d) 2^4/5^2
3. (a) 81 (b) 721 (c) 1/400 (d) 81/16
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1a.4×10^2 or 20^2
1b.2^-3×3^-2
1c.10^3
1d.4^2/5^2
2a.1/1331
2b.6^2
2c.7/2
2d.1331/64
3a.1/81
3b.729
3c.1/20^2
3d.81/16
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