57÷(74-1),
=57÷34,
=76;
76+57+76,
=133+76,
=209;
答:甲、乙两数的和是209.
已知A={x|x<1},B={x|-1<x<2},则A∪B=( )
A.{x|-1<x<1}
B.{x|1<x<2}
C.{x|x>-1}
D.{x|x<2}