(x+y)(x²-xy+y²) xy —————————-————其中:x=5,y=(x+y)(x²-xy+y²) xy—————————-————其中:x=5,y=-3 x²-y² x-y (“—
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![(x+y)(x²-xy+y²) xy —————————-————其中:x=5,y=(x+y)(x²-xy+y²) xy—————————-————其中:x=5,y=-3 x²-y² x-y (“—](/uploads/image/z/2668675-67-5.jpg?t=%28x%2By%29%28x%26%23178%3B-xy%2By%26%23178%3B%29+xy+%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94-%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E5%85%B6%E4%B8%AD%3Ax%3D5%2Cy%3D%28x%2By%29%28x%26%23178%3B-xy%2By%26%23178%3B%29++++++++xy%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94-%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E5%85%B6%E4%B8%AD%3Ax%3D5%2Cy%3D-3++++++++++++++++++++++x%26%23178%3B-y%26%23178%3B++++++++++++++++++x-y+++++++++++%28%E2%80%9C%E2%80%94)
(x+y)(x²-xy+y²) xy —————————-————其中:x=5,y=(x+y)(x²-xy+y²) xy—————————-————其中:x=5,y=-3 x²-y² x-y (“—
(x+y)(x²-xy+y²) xy —————————-————其中:x=5,y=
(x+y)(x²-xy+y²) xy
—————————-————其中:x=5,y=-3
x²-y² x-y (“———”是分子和分母中间那条线,我也忘记了 求过程给采纳)
(x+y)(x²-xy+y²) xy —————————-————其中:x=5,y=(x+y)(x²-xy+y²) xy—————————-————其中:x=5,y=-3 x²-y² x-y (“—
答案是8
(x+y)(x∧2-xy+y∧2) xy
_________________-- _______
x∧2-y∧2 x-y
=x∧2-xy+y∧2- xy
______________
x-y
=x-y带入数值就可以求出是8