Mathematics
Senior High
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数字I
答えの+2z xを+2x yと書いても正解ですか?
(2) (x−y+z)²
= x² + (− y)² + z ² + 2x(−y) +2.(-y)z +2zx
2
= x² + y² +2²-2xy-2yz +2zx
20656
11
= (x − y ) + 2(x-Y]Z tZ²
·x²2xX Y †y ²³ + 2xXZ-2 Y Z tZ²
= 1² + J ²7 2² +2 2 ² - 2 Y Z - 2xy
E
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