1/2(A²-B)+1/3(A-B²)+1/6(A²+B²)等于多少?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/28 12:03:13
1/2(A²-B)+1/3(A-B²)+1/6(A²+B²)等于多少?1/2(A²-B)+1/3(A-B²)+1/6(A²+B&#

1/2(A²-B)+1/3(A-B²)+1/6(A²+B²)等于多少?
1/2(A²-B)+1/3(A-B²)+1/6(A²+B²)等于多少?

1/2(A²-B)+1/3(A-B²)+1/6(A²+B²)等于多少?
=(1/2+1/3+1/6)A^2+(-1/2-1/3+1/6)B^2
=A^2-2/3B^2