①﹙-3a-b﹚² ②﹙a+b﹚²-﹙a-b﹚² 用两种方法做 ③3﹙m+1﹚²-5﹙m+1﹚﹙m-1﹚+2﹙m-1﹚² ④﹙5x²-4y﹚﹙-5x²+4y﹚ ⑤﹙x-1﹚﹙x+1﹚﹙x²-1﹚ ⑥98² ⑦50.1² ⑧﹙x-3y﹚﹙

①﹙-3a-b﹚² ②﹙a+b﹚²-﹙a-b﹚² 用两种方法做 ③3﹙m+1﹚²-5﹙m+1﹚﹙m-1﹚+2﹙m-1﹚² ④﹙5x²-4y﹚﹙-5x²+4y﹚ ⑤﹙x-1﹚﹙x+1﹚﹙x²-1﹚ ⑥98² ⑦50.1² ⑧﹙x-3y﹚﹙
①﹙-3a-b﹚² ②﹙a+b﹚²-﹙a-b﹚² 用两种方法做 ③3﹙m+1﹚²-5﹙m+1﹚﹙m-1﹚+2﹙m-1﹚² ④﹙5x²-4y﹚﹙-5x²+4y﹚ ⑤﹙x-1﹚﹙x+1﹚﹙x²-1﹚ ⑥98² ⑦50.1² ⑧﹙x-3y﹚﹙x+3y﹚-﹙x-3y﹚² ⑨﹙2x-y-3﹚﹙2x+y+3﹚ ⑩﹙5x+7y﹚²-﹙5x-7y﹚²

①﹙-3a-b﹚² ②﹙a+b﹚²-﹙a-b﹚² 用两种方法做 ③3﹙m+1﹚²-5﹙m+1﹚﹙m-1﹚+2﹙m-1﹚² ④﹙5x²-4y﹚﹙-5x²+4y﹚ ⑤﹙x-1﹚﹙x+1﹚﹙x²-1﹚ ⑥98² ⑦50.1² ⑧﹙x-3y﹚﹙
1 、原式=（-3a)²+2（-3a)(-b)+(-b)²=9a²+6ab+b²
2、原式=（a^2+2ab+b^2)-(a^2-2ab+b^2)=4ab
原式=【（a+b)+(a-b)][(a+b)-(a-b)]=2a*2b=4ab
3、原式=3(m^2+2m+1)-5(m^2-1)+2(m^2-2m+1)=3m^2+6m+3-5m^2+5+2m^2-4m+2=2m+10
4、原式=-(5x^2-4y)^2=-(25x^4-40x^2y+16y^2)=-25x^4+40x^2y-16y^2
5、原式=(x^2-1)(x^2+1)=x^4-1
6、原式=(100-2)^2=10000-400+4=9604
7、原式=(50+0.1)^2=2500+10+0.01=2510.01
8、原式=(x^2-9y^2)-(x^2-6xy+9y^2)=x^2-9y^2-x^2+6xy-9y^2=6xy-18y^2
9、原式=【2x-(Y+3)][2x+(Y+3)]=4x^2-(y+3)^2=4x^2-(y^2+6y+9)=4x^2-y^2-6y-9
10、原式=(25x^2+70xy+49y^2)-(25x^2-70xy+49y^2)=25x^2+70xy+49y^2-25x^2+70xy-49y^2=140xy
原式=10x*14y=140xy