作业帮2+4=2x3 2+4+6=3x4 2+4+6+8=4x5 2+4+6+8+10…50=( )x( )
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2+4=2x3 2+4+6=3x4 2+4+6+8=4x5 2+4+6+8+10…50=( )x( )
2+4=2x3 2+4+6=3x4 2+4+6+8=4x5 2+4+6+8+10…50=( )x( )
2+4=2x3 2+4+6=3x4 2+4+6+8=4x5 2+4+6+8+10…50=( )x( )
答案：=25x26
解析：首先数数等号的左边有几个数相加,第一个式子的左边是两个数相加,则等号的右边就是2x(2+1)=2x3,同理,再看第二个等式,左边是三个数相加,则等号右边就是3x(3+1)=3x4.最后的式子右边是50以前的偶数相加,50以前的偶数有25个,则可以判断出等式左边是有25个数相加,则等式右边的答案就应该是25x(25+1)=25x26
(25)*(26)
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运筹学……对偶问题.maxz=x1+2x2+3x3+4x4-x1+x2-x3-3x4=56x1-7x2+3x3-5x4