Question

有十二张数于代数的小学六年级卷子是什么?速求，谢谢

有十二张数于代数的小学六年级卷子是什么?速求，谢谢

Answer 1

3（a-b）的平方-9（a-b）-2（a-b）的平方+5（a-b）
=(a-b)2-4(a-b)

a的3次方-a的平方b+ab的平方+a的平方b-ab的平方+b的3次方
=a3-a2b+ab2+a2b-ab2+b3
=a3+b3

4x的平方-3x的3次方-x-4+2x的3次方+3x+x的3次方+9
=4x2-3x3-x-4+2x3+3x+x3+9
=4x2+2x+5

4ab的2次方-【3ab的2次方-2（3a得2次方b-1）】
=4ab2-3ab2+6a2b-2
=ab2+6a2b-2
9x+6x2 -3(x-2/3x2)
=9x+6x2-3x+2x2
=8x2+6x
1/4(-4x2+2x-8)-(1/2x-1)
=-x2+1/2x-2-1/2x+1
=-x2-1

(5a2-3b2)+(a2+b2)-(5a2+3b2)
=5a2-3b2+a2+b2-5a2-3b2
=a2-5b2
2a-（3a-2b+2）+（3a-4b-1)
=2a-3a+2b-2+3a-4b-1
=（2-3+3）a+（2-4）b-2-1
=2a-2b-3
2x-(x+3y)-(-x-y)-(x-y)
=2x-x+3y+x+y-x+y

=x+5y
-ab+3ba-(-2ab)
=-ab+3ba+2ab
=2ab+2ab
=4ab
-m-[-(2m-3n)]+[-(-3m)-4n]
=-m-(-2m+3n)+3m-4n
=-m-4m+2m-3n+3m
=-3n
2（2a+2ab)-2(2ab-1)-2ab-2
=4a+4ab-4ab+2-2ab-2
=4a-2ab
3ab-4ab+8ab-7ab+ab
=-8ab+9ab
=ab