68+69+70+71+72=( )乘以( )=( ) 21+23+25+27+29=( )乘以( )=( )

问题描述:

68+69+70+71+72=( )乘以( )=( ) 21+23+25+27+29=( )乘以( )=( )

额。。。。。。

68+69+70+71+72=( 70)乘以( 5)=(350 ) 21+23+25+27+29=( 25)乘以(5 )=(125 )

68+69+70+71+72=(70 )乘以(5)=(350 )
21+23+25+27+29=(25 )乘以( 5)=(125 )