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简便计算 1. 136+464+255 =600+255 =855 2. 1802-（796+204） =1802-1000 =802 3. 632-32+89 =600+89 =689 4. 947-47-95 =900-95 =805 5. 658+42-85 =700-85 =181 6. 91+（372-72） =91+300 =391 7. 187-87+81 =100+81 =181 8. 275+125-77 =400-77 =323 9. 236-236+69 =0+69 =69 10. 179+21-55 =200-55 =145 11. 875-75+122 =800+122 =922 12. 481-181-88 =300-88 =212 |
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