Question

tính nhanh:  58x42+32x58+74x42

Answer 1

  58x42+32x58+74x42

= 58x(32+42) +74x42

= 58 x 74+74x42

=74x(58+42)

=74x100

=7400

Answer 2

58x42+32x58+74x42

= 58x(42+32)+74x42

= 58x74+74x42

= 74x(58+42)

= 74x100

= 7400