2) (707+432)-132=707+(432-132)=707+300=1007
3) 972-(72+888)=(972-72)+888=900+888=1788
4) 906-(306+123)=(906-306)+123=600+123=723
2) (707+432)-132=707+(432-132)=707+300=1007
3) 972-(72+888)=(972-72)+888=900+888=1788
4) 906-(306+123)=(906-306)+123=600+123=723