一,计算
1,(X+Y/2)^2+(X-Y/2)^2
2,(7A-B-1)(7A+B-1)
二,已知A+B=5,AB=-6,求下列各式的值
1,A^2+B^2
2,A^2-AB+B^2
三,计算
(-12X^3*Y^4*Z)/(-4X^2*Y^3*Z)
(-1/4*A^6*B^4*C)/(2*A^3*C)
(2M^N+1)/(8M^2N+1)
6(A-B)^5/1/3(A-B)^2
(3A)^3*B^2/(8B^3*B^2)
3A^M+1*B^B+1/(-1/3A^MB^N-20*(1/9B)^2
-1/8A^5*B^4*C^2/(4B^2*B)
5(X-Y)^5/1/5(X-Y)^2
[X(X+1)+X^2*(X-1)]/(-3X)
[(M+N-P)(M+P+N)-(M+N)^2]/(-P)
就这些拉,要正确,