设第一个数为X
(X+2)(X+3)-X(X+1)=26
4X=20
X=5
∴X+1=6 X+2=7 X+3=8
则次四数为5,6,7,8
设第一个数为X
(X+2)(X+3)-X(X+1)=26
4X=20
X=5
∴X+1=6 X+2=7 X+3=8
则次四数为5,6,7,8
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