1. (520 ÷ 10 + 90 ÷ 9) × 8 + 7 × 2 × 5
= (52 + 10) × 8 + 14 × 5
= 62 × 8 + 70
= 496 + 70
= 566
2. (90 ÷ 10 ÷ 3 + 48) . (53 × 2 + 9)
= (9 ÷ 3 + 48) . (106 + 9)
= (3 + 48) . 115
= 51 . 115
= 5865
3. 32 × 2 ÷ 2 + 43 × 7 - 132 ÷ 2 + 47
= 64 ÷ 2 + 301 - 66 + 47
= 32 + 301 - 66 + 47
= 314 + 47
= 361
4. (530 ÷ 10 + 7) × 4 - (700 ÷ 7 ÷ 10 + 2) × 1
= (53 + 7) × 4 - (100 + 2) × 1
= 60 × 4 - 102
= 240 - 102
= 138
5. 200 + 33 × 8 + (723 ÷ 3 + 10 ÷ 10) × 9
= 200 + 264 + (241 + 1) × 9
= 200 + 264 + 242 × 9
= 200 + 264 + 2178
= 2642 + 2178
= 4820
6. 729 ÷ 9 + (720 ÷ 2 + 9) ÷ 3 - 4 × 4
= 81 + (360 + 9) ÷ 3 - 16
= 81 + 369 ÷ 3 - 16
= 81 + 123 - 16
= 184 - 16
= 168