① 72x25x4用簡便演算法計算
乘法分配律為:兩個數的和與一個數相乘,先將它們與這個數分別相乘,再相加,積不變.即:(a+b)×c=a×c+b×c.反過來則:a×c+b×c=(a+b)×c
72×25×4
= 72× ( 25×4)
= 72×100
= 7200
② 79x25x4的簡便運算
解:79x25x4等於( 7900 )
∵已知需求出79x25x4等於多少
X × Y × Z = X × (Y × Z)
∴79 x 25 x 4
= 79 × (25 × 4)
= 79 × 100
= 7900
答:79x25x4等於7900
③ 用簡便計算78x25x4=
78×25×4
=78×(25×4)
=78×100
=7800
④ 87x25x4簡便
87x25x4
=87x(25x4)
=87x100
=8700
⑤ 78x25x4簡便法學專業
78x25x4
=78×(25×4)
=78×100
=7800
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