640*31+310*36用简便运算
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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?