Question

tính nhanh

289*57+311*45+289*43+311*55

Answer 1

289 x 57 + 311 x 45 + 289 x 43 + 311 x 55

= 289 x ( 57 + 43 ) + 311 x ( 45 + 55 )

= 289 x 100 + 311 x 100

= ( 289 + 311 ) x 100

= 600 x 100

= 60000 

Answer 2

\(289x57+311x45+289x43+311x55\)\(=289x\left(57+43\right)+311x\left(45+55\right)\)

\(=289x100+311x100=100x\left(289+311\right)\)\(=100x600=60000\)