=37×(9 1+8+ 1)

=37× 100

=3700

9 1+67×9 1+32×9 1

=9 1×( 1+67+32)

=9 1× 100

=9 100

50×(? +4)

=50×? +50× 4 ... According to the law of multiplication and distribution.

=50×? +200

50×? +4,

Observing the above two formulas, it is found that it is also "50×? Just compare "200" and "4".

Difference: 200-4 = 196