①﹙χ²－2y²－z²﹚－﹙﹣y²＋3χ²－z²﹚＋﹙5χ²－y²＋2z²﹚=?②﹣﹛2a²b－[3abc－﹙4ab²－a²b﹚]﹜＝?

①﹙χ²－2y²－z²﹚－﹙﹣y²＋3χ²－z²﹚＋﹙5χ²－y²＋2z²﹚=?②﹣﹛2a²b－[3abc－﹙4ab²－a²b﹚]﹜＝?
①﹙χ²－2y²－z²﹚－﹙﹣y²＋3χ²－z²﹚＋﹙5χ²－y²＋2z²﹚=?
②﹣﹛2a²b－[3abc－﹙4ab²－a²b﹚]﹜＝?

①﹙χ²－2y²－z²﹚－﹙﹣y²＋3χ²－z²﹚＋﹙5χ²－y²＋2z²﹚=?②﹣﹛2a²b－[3abc－﹙4ab²－a²b﹚]﹜＝?
1 3x方-2y方+2z方