67*99+9.9*30(简算)
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![67*99+9.9*30(简算)](/uploads/image/z/1649502-54-2.jpg?t=67%2A99%2B9.9%2A30%28%E7%AE%80%E7%AE%97%29)
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67*99+9.9*30(简算)
67*99+9.9*30(简算)
67*99+9.9*30(简算)
67*99+9.9*30
=67 *99 + 3*99
=(67 +3) *99
= 70 *(100-1)
=7000-70
=6930
6930
67*99+9.9*30
=67*99+99*3
=99*(67+3)
=(100-1)*70
=100*70-70
=7000-70
=6930