Mathematics
Senior High
解き方教えてください！
*242
6
x+y_y+z
7
=
z+x
8
x2-y2
0 のとき
の値を求
x2+xz+yz-y2
めよ。
243
x + y + z = a axu+wa+arl=
が成り立つとキ
N
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