若(n+1)(n+2)比(n+3)(n+4)大6,求n的值
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若(n+1)(n+2)比(n+3)(n+4)大6,求n的值若(n+1)(n+2)比(n+3)(n+4)大6,求n的值若(n+1)(n+2)比(n+3)(n+4)大6,求n的值(n+1)(n+2)=N的
若(n+1)(n+2)比(n+3)(n+4)大6,求n的值
若(n+1)(n+2)比(n+3)(n+4)大6,求n的值
若(n+1)(n+2)比(n+3)(n+4)大6,求n的值
(n+1)(n+2)=N的平方+3N+2;
(n+3)(n+4)=N的平方+7N+12;
若(n+1)(n+2)比(n+3)(n+4)大6,说明(N的平方+3N+2)-(N的平方+7N+12)=6;
-4N-10=6
则N=-4
(n+1)(n+2)-(n+3)(n+4)=6
=(n^2+3n+2)-(n^2+7n+12)=6
-4n-10=6
-4n=16
n=-4
(n+1)(n+2)-(n+3)(n+4)=n平方+3n+2-n平方-7n-12=-4n-10=6
求出n=-4(负4)手提解答 负号不是很明显
n^2+3n+2-n^2-7n-12=6
n=-4
-4
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