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1ʮ2ʮ3ʮ4ʮ5ʮ6ʮ7дɳ˷ʽ

ѿԸдɳ˷ʽдӦòֻһ.5ʮ7ʮ5ʮ7һ3Dzܸдɳ˷ʽ,Ըдɻʽ:5x2+7x2-3;5ʮ7ʮ5ʮ7һ4Ըд5X4;5ʮ7ʮ5ʮ7+4Ըд7X4

1+89,2+79,3+69,4ʮ59

5ʮ5ʮ5ʮ5ʮ5ʮ5һ7дɺг˷ʽ :5+5+5+5+5+5-7=235*6-7=235+5+5+5+5+5-7=5*6-7 :ָͬӷĿݷʽ.Ϊ.˷򵥵֮һ. ij˷

7+6+5+4+3=(7+3)+(6+4)+(5+5)+(4+6)+(3+7)2 =5*10*

2+2+2+2+4=2*4+4=4*(2+1)=4*3

(1+8)+(2+7)+(3+6)+(4+5)=9x4=36

Ѽӷʽдɳ˷ʽ.5ʮ5ʮ10ʮ1o5+5+10+10=5+5+5+5+5+5=5*6=30

5*3 8*3

Ե.3ʮ3ʮ3ʮ2ʮ1 Ҫһӷ3+3+3+3=3*4 ʾ43 4+4+4=4*3 ʾ34 ͬ 岻ͬ

ȫȷ,56Ҳ6x5

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