1:
① 29.2%
② 12.5%
③ 114.1%
2:
﹙84--75﹚÷75
=9÷75
=12%
3:
①﹙162--158﹚÷158≈0.025=2.5%
②﹙52--46﹚÷52=6÷52≈0.115=11.5%
4:
﹙6670--6400﹚÷6670=270÷6670≈0.04=4%