1999*3.14+199.9*31.4+19.99*314 简算

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1999*3.14+199.9*31.4+19.99*314 简算
1999*3.14+199.9*31.4+19.99*314 简算

1999*3.14+199.9*31.4+19.99*314 简算
1999*3.14+199.9*31.4+19.99*314
=1999×3.14+1999×3.14+1999×3.14
=1999×3.14×3
=(2000-1)×9.42
=18840-9.42
=18830.58

1999×3.14+199.9×31.4+19.99×314
=1999×3.14+1999×3.14+1999×3.14
=1999×3.14×3
=18830.58

1999*3.14+199.9*31.4+19.99*314 =1999*3.14+199.9*10*3.14+19.99*100*3.14=1999*3.14+1999*3.14+1999*3.14=1999*3*3.14=18830.58

1999×3、14×3