1. 25×32的兩種簡便方法
解:25×32等於( 800 )
∵已知需求出25×32等於多少
X × (Y + Z)= X × Y + X × Z
∴方法一
25 × 32
= 25 × (30 + 2)
= 25 × 30 + 25 × 2
= 750 + 50
= 800
方法二
25 × 32
= 25 × (4 × 8)
= 25 × 4 × 8
= 100 × 8
= 800
答:25×32等於800
2. 25X(32+4)用簡便方法計算
25X(32+4)用簡便計算
=25x36
=25x(30+6)
=25x30+25x6
=750+150
=900