640*31+310*36用简便运算

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 15:23:36
640*31+310*36用简便运算
x)3312666Rfϧxɾ/OxnMR>~v6 E B@=@ m=pQCS 1j d~K4k% " #`PE@6k{>s]mO'Lg>8f

640*31+310*36用简便运算
640*31+310*36用简便运算

640*31+310*36用简便运算
640*31+310*36
=640*31+31*360
=31*(640+360)
=31*1000
=31000

=640*31+31*10*36
=640*31+31*360
=(640+360)*31
=1000*31
=31000

640*31+310*36
=64*310+310*36
=310*(64+36)=310*100

=640*31+31*10*36
=640*31+31*360
=(640+360)*31
=1000*31
=31000 明白了吗?