Hot issues：
This module collects the frequently encountered and difficult problems for reference only.
This module collects the frequently encountered and difficult problems for reference only.
Current location：Hot issues > Answer
规定一种运算$*$，有$a*b=a－b＋a×b$。如果$9*x=41$，求$x$的值。
由定义可知： $$ 9*x=9-x+9\times x $$ 又因为 $$ 9*x=41 $$ 所以 $$ \begin{align} &9-x+9\times x=41\\ =>\ &8x=32\\ =>\ &x=4 \end{align} $$ 所以，所求的$x$的值为：$x=4$