解:24x62-12x4等于( 1440 )
∵已知需求出24x62-12x4等于多少
X × Y - X × Z = X × (Y - Z)
∴24 x 62 - 12 x 4
= 24 × 62 - 12 × (2 × 2)
= 24 × 62 - 12 × 2 × 2
= 24 × 62 - 24 × 2
= 24 × (62 - 2)
= 24 × 60
= 1440
答:24x62-12x4等于1440
24X62一12x4
=24x2X31一12x4
=48X31一48x1
=48X(31一1)
=48x30
=1440
=24x2x31-12x4
=48×31-48x1
=48×(31-1)
=48X30
=1440