Question

当x为何值时,3/2x²+1/4（x-1）和1/3（x-2）互为相反数?要完整的过程,

Answer 1

7×13×(7分之8-13分之14)

=7×13×7分之8-7×13×13分之14

=13×8-7×14

=104-98

=6

A

x(x-2)<=0

0<=x<=2

B

(x-1)(x-3)<=0

1<=x<=3

所以A∩B是1<=x<=2

有一个公式

CuA U CuB=Cu(A∩B)={x|x<1,x>2}