A=-xy+yz=xz,B=-2xy+yz-xz,求下列式子的代数和(1)A+B (2)3A-2B当多项式-5x³-(2m-1)x²+(2-3n)x-1不含关于X的二次项和一次项时,求M,N的值
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![A=-xy+yz=xz,B=-2xy+yz-xz,求下列式子的代数和(1)A+B (2)3A-2B当多项式-5x³-(2m-1)x²+(2-3n)x-1不含关于X的二次项和一次项时,求M,N的值](/uploads/image/z/2115335-47-5.jpg?t=A%3D-xy%2Byz%3Dxz%2CB%3D-2xy%2Byz-xz%2C%E6%B1%82%E4%B8%8B%E5%88%97%E5%BC%8F%E5%AD%90%E7%9A%84%E4%BB%A3%E6%95%B0%E5%92%8C%EF%BC%881%EF%BC%89A%2BB+%282%293A-2B%E5%BD%93%E5%A4%9A%E9%A1%B9%E5%BC%8F-5x%26sup3%3B-%EF%BC%882m-1%29x%26sup2%3B%2B%EF%BC%882-3n%29x-1%E4%B8%8D%E5%90%AB%E5%85%B3%E4%BA%8EX%E7%9A%84%E4%BA%8C%E6%AC%A1%E9%A1%B9%E5%92%8C%E4%B8%80%E6%AC%A1%E9%A1%B9%E6%97%B6%2C%E6%B1%82M%2CN%E7%9A%84%E5%80%BC)
A=-xy+yz=xz,B=-2xy+yz-xz,求下列式子的代数和(1)A+B (2)3A-2B当多项式-5x³-(2m-1)x²+(2-3n)x-1不含关于X的二次项和一次项时,求M,N的值
A=-xy+yz=xz,B=-2xy+yz-xz,求下列式子的代数和
(1)A+B
(2)3A-2B
当多项式-5x³-(2m-1)x²+(2-3n)x-1不含关于X的二次项和一次项时,求M,N的值
A=-xy+yz=xz,B=-2xy+yz-xz,求下列式子的代数和(1)A+B (2)3A-2B当多项式-5x³-(2m-1)x²+(2-3n)x-1不含关于X的二次项和一次项时,求M,N的值
1,A=-xy+yz-xz,B=-2xy+yz-xz,
(1)A+B
=-xy+yz-2xy+yz-xz
=-3xy+2yz-2xz
(2)3A-2B
=3(-xy+yz-xz)-2(-2xy+yz-xz)
=-3xy+3yz-3xz+4xy-2yz+2xz
=xy+yz-xz
2,当多项式-5x³-(2m-1)x²+(2-3n)x-1不含关于X的二次项和一次项时,
2m-1=0,m=1/2
2-3n=0,n=2/3
A=-xy+yz-xz,B=-2xy+yz-xz
(1)
A+B=-xy+yz-xz-2xy+yz-xz
=-3xy+2yz-2xz
(2)
3A-2B
=3(-xy+yz-xz)-2(-2xy+yz-xz)
=-3xy+3yx-3xz+4xy-2yx+2xz
=xy+yx-xz
多项式-5x³-(2m-1)x²+(2-3n)x-1不含关于X的二次项和一次项
2m-1=0 2-3n=0
m=1/2 n=2/3
第一题 =XZ-XY
后半段是2m-1=0,2-3n=0;
求的m=1/2,n=2/3