计算(12345+23451+34512+45123+51234)/(1+2+3+4+5)脱式,简便计算,急.
问题描述:
计算(12345+23451+34512+45123+51234)/(1+2+3+4+5)脱式,简便计算,急.
答
(12345+23451+34512+45123+51234)/(1+2+3+4+5)
=(1+2+3+4+5)X11111/(1+2+3+4+5)
=(1+2+3+4+5)/(1+2+3+4+5)X11111
=1X11111
=11111