3*(-9)-(-1)^4+(-2)^3-1
3*2
9(2-x3)
9(2-x
_
3)
(200x-300)รท100
-4/1 * -3/7
-4/1 * -3/7 * -4 7/4
-4/1* -3/7 * -4 7/4
