(x+y)²+(X+y)+四分之一
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![(x+y)²+(X+y)+四分之一](/uploads/image/z/3151337-41-7.jpg?t=%28x%2By%29%26%23178%3B%2B%28X%2By%29%2B%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80)
(x+y)²+(X+y)+四分之一
(x+y)²+(X+y)+四分之一
(x+y)²+(X+y)+四分之一
(x+y)²+(X+y)+1/4
=【(x+y)+1/2】²
=(x+y+1/2)²
=(x+y)²+2×(x+y)×1/2+(1/2)²
=[(x+y)+1/2]²
=(x+y+1/2)²
(x+y)²+(X+y)+四分之一
=(x+y)²+2*(X+y)*0.5+0.5^2
=(x+y+0.5)^2
将x+y=a,1/2=b
(a+b)²=a²+2ab+b²
所以答案是(x+y+1/2)²
(x+y)²+(x+y)+1/4 =(x+y)²+2*(1/2)(x+y)+(1/2)²==(x+y+1/2)²
=(x+y)(x+y-1)+四分之一
(X+Y)^2+(X+Y)+1/4
=(X+Y)^2+2×1/2(X+Y)+(1/2)^2
=[(X+Y)+1/2]^2