若|5m-2n+29|+(2m+3n+4﹚的四次方=0,则﹙m+n﹚的立方=------ 急
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![若|5m-2n+29|+(2m+3n+4﹚的四次方=0,则﹙m+n﹚的立方=------ 急](/uploads/image/z/607004-44-4.jpg?t=%E8%8B%A5%7C5m%EF%BC%8D2n%EF%BC%8B29%7C%EF%BC%8B%282m%EF%BC%8B3n%EF%BC%8B4%EF%B9%9A%E7%9A%84%E5%9B%9B%E6%AC%A1%E6%96%B9%EF%BC%9D0%2C%E5%88%99%EF%B9%99m%EF%BC%8Bn%EF%B9%9A%E7%9A%84%E7%AB%8B%E6%96%B9%EF%BC%9D------+%E6%80%A5)
若|5m-2n+29|+(2m+3n+4﹚的四次方=0,则﹙m+n﹚的立方=------ 急
若|5m-2n+29|+(2m+3n+4﹚的四次方=0,则﹙m+n﹚的立方=------ 急
若|5m-2n+29|+(2m+3n+4﹚的四次方=0,则﹙m+n﹚的立方=------ 急
|5m-2n+29|+(2m+3n+4﹚的四次方=0
所以:
5m-2n+29=0
2m+3n+4=0
所以:
m= -5
n=2
(m+n)³
= (-5+2)³
=(-3)³
= -27
肯定对,有什么不明白可以继续问,随时在线等.
∵|5m-2n+29|+(2m+3n+4﹚的四次方=0
∴5m-2n+29=0
2m+3n+4=0
解得:m=-5
n= 2
∴(m+n)³=(-5+2)³=-27
5m-2n+29=0
2m+3n+4=0
10m-4n+58=0
10m+15n+20=0
19n- 38=0
n=2
m=- 5
﹙m+n﹚^3=- 27
5m-2n=-29,2m+3n+4=0。两式子联立得m=-5,n=2\7
(m+n)的立方=-3的立方=-27