初二数学提公因式的题:题在下面1 7(a-1)+x(a-1)2 3(a-b)方+6(b-a)3 2(m-n)方-m(m-n)4 x(x-y)方-y(y-x)方5 m(a方+b方)+n(a方+b方)6 18(a-b)立方-12b(b-a)方7 (2a+b)(2a-3b)-3a(2a+b)8 x(x+y)(x-y)-x(x+y)方
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初二数学提公因式的题:题在下面1 7(a-1)+x(a-1)2 3(a-b)方+6(b-a)3 2(m-n)方-m(m-n)4 x(x-y)方-y(y-x)方5 m(a方+b方)+n(a方+b方)6 18(a-b)立方-12b(b-a)方7 (2a+b)(2a-3b)-3a(2a+b)8 x(x+y)(x-y)-x(x+y)方
初二数学提公因式的题:题在下面
1 7(a-1)+x(a-1)
2 3(a-b)方+6(b-a)
3 2(m-n)方-m(m-n)
4 x(x-y)方-y(y-x)方
5 m(a方+b方)+n(a方+b方)
6 18(a-b)立方-12b(b-a)方
7 (2a+b)(2a-3b)-3a(2a+b)
8 x(x+y)(x-y)-x(x+y)方
初二数学提公因式的题:题在下面1 7(a-1)+x(a-1)2 3(a-b)方+6(b-a)3 2(m-n)方-m(m-n)4 x(x-y)方-y(y-x)方5 m(a方+b方)+n(a方+b方)6 18(a-b)立方-12b(b-a)方7 (2a+b)(2a-3b)-3a(2a+b)8 x(x+y)(x-y)-x(x+y)方
1、原式=(7+x)(a-1)
2、原式=3(a-b)方-6(a-b)=3(a-b)(a-b-2)
3、原式=(m-n)(2m-2n-m)=(m-n)(m-2n)
4、原式=x(x-y)方-y(x-y)方=(x-y)(x-y)方=(x-y)立方
5、原式=(m+n)(a方+b方)
6、原式=18(a-b)立方-12b(a-b)方=6(a-b)方(3a-3b-2b)=6(a-b)方(3a-5b)
7、原式=(2a+b)(2a-3b-3a)= -(2a+b)(a+3b)
8、原式=(x+y)(x方-xy-x方-xy)=(x+y)(-2xy)= -2xy(x+y)
1=(A-1)(7+X)
2=3(B-A)方+4AB+6(B-A)=[3(B-A)](B-A+4AB+2)
3=(M-N)(M-2N)
4=(XY)(X-Y+Y-X)(X-Y-Y+X)=(XY)2(X-Y)=2XY(X-Y)
5=MN(A方+B方)
6=
1.原式=(a-1)(7+x)=7a+xa-x-7
2.原式=3(a-b)-6(a-b)=(a-b)(3-6)=-3(a-b)=3b-3a
3.原式=2(m-n)(m-n)-m(m-n)=(m-n)[2(m-n)-m]=(m-n)(m-2n)
...
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1.原式=(a-1)(7+x)=7a+xa-x-7
2.原式=3(a-b)-6(a-b)=(a-b)(3-6)=-3(a-b)=3b-3a
3.原式=2(m-n)(m-n)-m(m-n)=(m-n)[2(m-n)-m]=(m-n)(m-2n)
=m2-2n2-3mn
4.原式=x(x-y)2+y(x-y)2=(x-y)2(x+y)=x3+y3-x2y-xy2
5.原式=(a2+b2)(m+n)=ma2+mb2+na2+nb2
6.原式=18(a-b)2+12b(a-b)2=(a-b)2(18+12b)
=18a2+18b2-36ab+12a2b+12b3-24ab2
7.原式=(2a+b)(2a-3b-3a)=(2a+b)[-(a+3b)]=-(2a2+3b2+7ab)
8.原式=[x(x+y)](x-y-x)=[x(x+y)](-y)=-(x2y+xy2)
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