巧算题:9+98+997+9996+99995+999994+21=?
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巧算题:9+98+997+9996+99995+999994+21=?
巧算题:9+98+997+9996+99995+999994+21=?
巧算题:9+98+997+9996+99995+999994+21=?
9+98+997+9996+99995+999994+21
=10-1+100-2+1000-3+10000-4+100000-5+1000000-6+21
=1111110-21+21
=1111110