解:29x72等于( 2088 )
∵已知需求晌磨出御闷29x72等于多镇谨弯少
X × (Y - 1) = X × Y - X
∴29 x 72
= (30 - 1)× 72
= 30 × 72 - 1 × 72
= 2160 - 72
= 2088
答:29x72等于2088
29×72=2088,段神桥游列算式如图握消亏:
29*72
=30*72-72
=2160-72
=2100-12
=2088
2088