简便方法99乘以98分之97

2024-11-15 22:58:23
推荐回答(4个)
回答1:

先用加法分配律把99转换成98+1,再根据乘法结合律使得运算简便。

=99×97/98

=(98+1)x97/98

=98x97/98+1x97/98

=97+97/98

=97又97/98

1、乘法分配律

简便计算中最常用的方法是乘法分配律。乘法分配律指的是ax(b+c)=axb+axc其中a,b,c是任意实数。相反的,axb+axc=ax(b+c)叫做乘法分配律的逆运用(也叫提取公约数),尤其是a与b互为补数时,这种方法更有用。

2、乘法结合律

乘法结合律也是做简便运算的一种方法,用字母表示为(a×b)×c=a×(b×c),它的定义(方法)是:三个数相乘,先把前两个数相乘,再和第三个数相乘;或先把后两个数相乘,再和第一个数相乘,积不变。

扩展资料

分数乘除法

1、分数乘整数,分母不变,分子乘整数,最后模歼能约分的要约分。

2、分数乘分数,用分子乘分子,用分母乘分母,最后能约分的要约分。

3、分数除以整数,分母不变,如果分子是整数的倍数,则用分子除以整数,最后能约分的要约分。

4、分数除以整洞磨数,分母不变,如果旦颤冲分子不是整数的倍数,则用这个分数乘这个整数的倒数,最后能约分的要约分。

5、分数除以分数,等于被除数乘除数的倒数,最后能约分的要约分。

参考资料来源:百度百科-分数

回答2:

99*(97/98)
=(98+1)*(97/98)
=98*(97/氏雹空98)+97/肆乎98
=97+97/98
=97又歼瞎98分之97

回答3:

99×97/98
解陆旦:原式=(98+1)早蠢扰×97/98
=97+97/98
97又97/档纳98

回答4:

99*97/98
=99*1-99*1/98
=99-99/98
=97又97/98

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