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列竖式计算 892×57=705×52=840×90=690×98=505×60=9...

892×57=50844;705×52=36660;840×90=75600;690×98=67620505×60=30300;989×80=79120.

=505×4÷100 =5.05×4 =20.2

56×43=2408; 56 × 43 . 168 224 . 2408 172×21=3612; 172 × 21 . 172 344 . 3612 505×60=30300; 505 × 60 . 30300 240×80=19200. 240 × 80 . 19200

505 x 45 ____ 2525 2020 _____ 22725

32×216=6912 216× 32. 432 648 .6912505×80=40400 505× 80 .4040022×750=16500 750×22. 150 150 .16500

(1)505×8=4040 505× 8. 4040 (2)315×6=1890 315× 6. 1890 (3)420×9=3780 420× 9. 3780

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