Question

Tính nhanh :

18 .15 + 35 + 15 . 32 +35 . 49

Answer 1

`@` `\text {Ans}`

`\downarrow`

`18*15 + 35 + 15*32 + 35*49`

`= 15 (18+32) + 35(1+49)`

`= 15*50 + 35*50`

`= 50*(15+35)`

`= 50*50`

`= 2500`

Answer 2

=15*50+35*50

=50*50

=2500

Answer 3

\(18.15+35+15.32+35.49\)

\(=18.15+35.1+15.32+35.49\)

\(=\left(15+35\right).\left(18+32+49+1\right)\)

\(=50.100\)

\(=5000\)

Answer 4

=15*50+35*50

=50*50

=2500