6.98×51^2-49^2×6.98简便

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6.98×51^2-49^2×6.98简便

6.98×51^2-49^2×6.98简便
6.98×51^2-49^2×6.98
简便

6.98×51^2-49^2×6.98简便
6.98×51^2-49^2×6.98
=6.98×(51^2-49^2)
=6.98×(51+49)×(51-49)
=6.98×100×2
=698×2
=(700-2)×2
=1400-4
=1396

1396

6.98×51^2-49^2×6.98
=6.98*(51^2-49^2)
=6.98*(51+49)*(51-49)
=6.98*100*2
=698*2
=(700-2)*2
=700*2-2*2
=1400-4
=1396

原式=6.98*(51^2-49^2)
=6.98*(51+49)*(51-49)=698*2=1396

6.98×51^2-49^2×6.98
=6.98*(51^2-49^2)
=6.98*(51+49)(51-49)
=6.98*100*2
=1396

=6.98*(2601-2401)
=6.98*200=1396

原式=6.98*(51^2-49^2)
=6.98*(51+49)*(51-49)
=6.98*100*2
=1396