Question

2.78＋27.8×9.9简算，急用

2.78＋27.8×9.9简算，急用

Answer 1

2.78＋27.8×9.9
=2.78+2.78x99
=2.78x（1+99）
=2.78x100
=278

追问

谢谢

追答

不谢，点击采纳即可

Answer 2

=2.78+2.78*99
=2.78*(1+99)
=2.78*100
=278

追问

谢谢

Answer 3

2.78+27.8*9.9
=2.78+2.78*9.9*10
=2.78+2.78*99
=2.78*（99+1）
=2.78*100
=278

Answer 4

=27.8×0.1＋27.8×9.9
=27.8×(0.1+9.9)
=27.8×10
=278

Answer 5

2.78+27.8*99=2.78+2.78*10*9.9=2.78+2.78*99=2.78*(1+99)=278