Question

634-[(206x4-618:3):3]x2+3x(10:2+630:9)

Answer 1

634 - [(206*4-618:3):3]*2+3*(10:2+630:9) =
=634 - (( 824 -206):3)*2+3*(5+70) =
= 634 - ( 618 : 3) *2 + 3*(5+70) =
= 634 - ( 618 : 3 ) * 2 + 3*75 =
= 634 - 206 * 2 + 3*75 =
= 634 - 206*2 + 225 =
=  634 - 412 + 225 = 859 - 412 = 447 

Answer 2

643-[(206×4-618:3):3]×2+3×(10:2+630:9)=

643-[(824-206):3]×2+3×(5+70)=
643-[(618:3)]×2+3×75=
643-206×2+225=
643-412+225= 231+225=456