Question

tính nhanh

42 x 58 + 47 x 156 - 47 - 47 x 114

Answer 1

42 x 58 + 47 x 156 - 47 - 47 x 114

=42 x 58 + 47 x 156 - 47 x 1 - 47 x 114

=42 x 58 + 47 x (156 - 1 - 114)

=42 x 58 + 47 x 41

=2436 + 1927

=4363

Answer 2

42x58+47x156-47x114

= 42x58+47x(156-1-114)

= 42x58+47x41

= 41x58+47x41+58

= 41x(58+47)+58

= 41x105+58

= 4305+58

= 4363