计算题,1：(x+1/2)^2+(x-1/2)^2+(x+1/2)(x-1/2)（1／3a-3/4b)^2-(1/3a+3/4b)^2填空：x^2+6x+=(x+3)^2x^2++9y^2=(x+3y)^2a^2++1/4=(a+1/2)^2x^2-8xy+=(x-4y)^2(a+b)^2-=(a-b)^2化简：（x+3y)^2+2(x-y)(x+y)+(x-3y)^2〔（a-1/2)^2+(a+

Question

计算题,1：(x+1/2)^2+(x-1/2)^2+(x+1/2)(x-1/2)
（1／3a-3/4b)^2-(1/3a+3/4b)^2
填空：x^2+6x+_____=(x+3)^2
x^2+____+9y^2=(x+3y)^2
a^2+____+1/4=(a+1/2)^2
x^2-8xy+___=(x-4y)^2
(a+b)^2-____=(a-b)^2
化简：（x+3y)^2+2(x-y)(x+y)+(x-3y)^2
〔（a-1/2)^2+(a+1/2)^2](2a^2-1/2)
(x+2y+3)^2-(x-2y+3)(x-2y-3)

Answer 1

1：(x+1/2)^2+(x-1/2)^2+(x+1/2)(x-1/2)=x^2+x+1/4+x^2-x+1/4+x^2-1/4=3x^2+1/4（1／3a-3/4b)^2-(1/3a+3/4b)^2=(1/3a-3/4b+1/3a+3/4b)(1/3a-3/4b-1/3a-3/4b)=(2/3a)(-3/2b)=-ab填空：x^2+6x+__9___=(x+3)^2x^2+__6xy...