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5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 14 37 42 63 9678 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 14 37 42 63 78 96 1 2 3 4 5 6 7 8 9 10 1514 16 15-1 15+1 19 21 20-1 20+1 20 你能发现 什么? 18-1 = 18+1 = 17 19 1817 19 17和19是18的相邻数。 37-1 = 37+1 = 50-1 = 50+1 = 36 38 49 51 60 7063 63   = 707+ 25+   = 30 36+   = 40 49+   = 50 64+   = 70 81+   = 90 98+  = 100 5 1 9 4 6 2 60 63 70 63   = 603- 21-   = 20 33-   = 30 48-   = 40 77-   = 70 56-   = 50 94-   = 90 1 4 8 7 6 3 2420 3024-4 24+6 5550 60 6860 70 8380 90 55-5 68-8 83-3 55+5 68+2 83+7 17+3 = 7+3 = 37+3 = 10 20 40 4+6 = 44+6 = 24+6 = 38+2 = 58+2 = 8+2 =10 30 50 10 40 60 6+   = 10 49-   = 40 92-   = 90 73+  = 80 86-   = 100-   = 25+   = 3+   = 4 9 7 2 10+30= 70-20= 59+1= 30-1= 100-10= 99+ 1= 86+4= 52+ 8= 25- 5= 66-6= 40- 2= 46- 1= 79-1=15+ 5= 80+20= 85+  = 10049-   = 40 查看更多

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