小二甲班正義傑 三 選擇題： 1. (1) 25+14 = 25+10+4 = 36+3 = (39) 2. (2) 54-32 = 54-30-2 = 24-2 = (22) 3. (3) 42-15 = (27 +16 = (43) 4. (3) 65-33 = 65-30-3 = 35-3 = (32) 5. (3) 97-37 = 97-30-7 = 67-6 = (61) 7. (1) 8. (3) 24+44 = 24+40+4 = 64+4 = (68) 9. (2) 37+30 = (67) 10. (1) 12+5 = (17) 11. (2) 38-6 = (32) 12. 38 12. 38-12 = 38-10 12. 38-12 = 38-10-2 = 29-2 = (27) -16= (13) 13. (3) 12+11 = 12+10+1 = 22+1 = (23) 14. (3) 32+6 = (38) 15. (4) 55-17 = (38) 18. (4) 19. 25-12 = (13) +20 = (33) 20. 72-15 = (57) -16 = (41) |
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