1.x^4 +5x^4

1.x^4 +5x^4 -3x^2 -7x^2+6x-5
2.6x^2 -2xy +y^2 -x^2 +6xy +4x -y +1
3.a^4 +3a^2 b+3ab^2 -6^4 +4a^2 b-6ab^2 +10
4.x^3 -5^2 +7x -4x^3 +6x^2-11
5.x^3 -3x^2 +7x-2-4x^2-5x +1
6.a^4 -2a^3 b-3ab^2-6ab+4a^3 b-5ab^2 +3ab
合并同类项啊...

第3题和第4题你可能抄错了,我给改了
1.x^4 +5x^4 -3x^2 -7x^2+6x-5
= 6x^4 -10x^2+6x-5
2.6x^2 -2xy +y^2 -x^2 +6xy +4x -y +1=5x^2+4xy+y^2+4x -y +1
3.a^4 +3a^2 b+3ab^2 -6a^4 +4a^2 b-6ab^2 +10=-5a^4+7a^2 b-3ab^2 +10
4.x^3 -5x^2 +7x -4x^3 +6x^2-11= -3x^3 +x^2+7x-11
5.x^3 -3x^2 +7x-2-4x^2-5x +1= x^3-7x^2+2x+1
6.a^4 -2a^3 b-3ab^2-6ab+4a^3 b-5ab^2 +3ab= a^4+2a^3-8ab^2-3ab
如果没错
3.a^4 +3a^2 b+3ab^2 -6^4 +4a^2 b+10= a^4 +7a^2+3ab^2+1306
4.x^3 -5^2 +7x -4x^3 +6x^2-11=-3x^3+6x^2+7x-36
我希望你以后能认真完成作业,不要懒.学习这个东西市容不得懒的,