12.5*9.8-4.9*5怎么简便

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12.5*9.8-4.9*5怎么简便

12.5*9.8-4.9*5怎么简便
12.5*9.8-4.9*5怎么简便

12.5*9.8-4.9*5怎么简便
12.5 × 9.8 - 4.9 × 5
= 12.5 × 2 × 4.9 - 4.9 × 5
= 25 × 4.9 - 4.9 × 5
= 4.9 × (25 - 5)
= 4.9 × 20
= 98

12.5*9.8-4.9*5
=12.5*2*4.9-4.9*5
=25*4.9-4.9*5
=4.9*(25-5)
=4.9*20
=98

25*4.9-4.9*5
=4.9*(25-5)
=4.9*20
=98