8×259+381怎么巧算
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8×259×+381 =8×(250+9)+381
咨询记录 · 回答于2023-01-02
8×259+381怎么巧算
8×259×+381 =8×(250+9)+381
=8×250+8×9+381=2000+72+381=2453
1719+281×5简便运算
1719+(200+81)×5
=1719+200×5+81×5
=1719+1000+405
=12124
83×4+296
=(80+3)×4+296
=80×4+3×4+296
=320+12+296
=628