If =a(a+1)/2 for all integres a and b =,then is( )
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If =a(a+1)/2 for all integres a and b =,then is( )
![If =a(a+1)/2 for all integres a and b =,then is( )](/uploads/image/z/14879863-55-3.jpg?t=If+%3Da%28a%2B1%29%2F2+for+all+integres+a+and+b+%3D%2Cthen+is%28+%29)
=a(a+1)/2
=7(7+1)/2=28
b=28
=28(28+1)/2=406
再问: 不对,答案是231
=7(7+1)/2=28
b=28
=28(28+1)/2=406
再问: 不对,答案是231
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