若实数a,b满足| a+2 |+√b-4=0.求a²/b的值.
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若实数a,b满足| a+2 |+√b-4=0.求a²/b的值.
若实数a,b满足| a+2 |+√b-4=0.求a²/b的值.
若实数a,b满足| a+2 |+√b-4=0.求a²/b的值.
| a+2 |≥0 √b-4≥0
所以
a+2=0 b-4=0
a=-2 b=4
于是
a²/b=4/4=1
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