Question

Tính nhanh:

58*42+32*58+74*42=?

Answer 1

58x42+32x58+74x42

= 58x ( 42+ 32 ) + 74 x 42

=58 x 74 + 74 x 42

= 74 x ( 58+ 42)

=74 x 100

=7 400

Answer 2

58.(42+32)+74.42=58.74+74.42=74.(58+42)=74.100=7400