Question

Tính nhanh 85.74+17.130

Answer 1

=85(74+26)

=85*100=8500

Answer 2

\(85.74+17.130\)

\(=85.74+17.5.26\)

\(=85.74+85.26\)

\(=85.\left(74+26\right)\)

\(=85.100\)

\(=8500\)

Answer 3

`@` `\text {Ans}`

`\downarrow`

`85*74 + 17*130`

`= 17*5*74 + 17*5*26`

`= 17*5*(74 + 26)`

`= 85*100`

`= 8500`