① 72x25x4用简便算法计算
乘法分配律为:两个数的和与一个数相乘,先将它们与这个数分别相乘,再相加,积不变.即:(a+b)×c=a×c+b×c.反过来则:a×c+b×c=(a+b)×c
72×25×4
= 72× ( 25×4)
= 72×100
= 7200
② 79x25x4的简便运算
解:79x25x4等于( 7900 )
∵已知需求出79x25x4等于多少
X × Y × Z = X × (Y × Z)
∴79 x 25 x 4
= 79 × (25 × 4)
= 79 × 100
= 7900
答:79x25x4等于7900
③ 用简便计算78x25x4=
78×25×4
=78×(25×4)
=78×100
=7800
④ 87x25x4简便
87x25x4
=87x(25x4)
=87x100
=8700
⑤ 78x25x4简便法学专业
78x25x4
=78×(25×4)
=78×100
=7800
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谢谢采纳哦~