Question

tính nhanh

35 x 49 + 51 x 36 

Answer 1

35 x 49 + 51 x 36 

=(36-1) x 49 + 51 x 36

=36 x 49 - 1 x 49 + 51 x 36

=36 x 49 - 49 + 51 x 36

=36 x (49+51) - 49

=36 x 100 - 49

=3600 - 49

=3551

Answer 2

\(\text{35 x 49 + 51 x 36 }\)

\(\text{= 1715 + 1836}\)

\(\text{= 3551}\)

Answer 3

\(35.49+51.36\)

\(=35.49+51.\left(35+1\right)\)

\(=35.49+51.35+51\)

\(=35.\left(49+51\right)+51\)

\(=35.100+51=3551\)