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There is one question that cannot be answered: 1+3+5+7+. . . . . . +97+99=(? )x(？ )=(? ) ask experts for answers.
Analysis:

1+3+5+7+。 . . . . . +97+99

=( 1+99)+(3+97)+(95+5)。 . . +(49+5 1)

=50/2× 100

=25× 100

=2500

1+3+5+7+。 . . . . . +97+99=(25)x( 100)=(2500)

(If you don't understand, you can ask and hope to adopt)

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