Mathematics
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==equ==
Unary equation
Multivariate equation
==cal==
Solution inequality
Mathematical calculation
Fractional calculation
Mathematical statistics
Resolving prime factor
Fraction and Decimal Interactions
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==LiAl==
Determinant
Matrix multiplication
Inverse matrix
==der==
Derivative function
==img==
Function image
==que==
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若$A(m+4,m-9)$在$y$轴上,求$m$的值。
解:
因为$A(m+4,m-9)$在$y$轴上,所以有 \begin{align} m+4=&0\\ =>m=&-4 \end{align} 即,所求的$m$的值为
$m=-4$
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