Mathematics
Junior High
Resolved
(3)の問題で答えが6-6√6でも○ですか?
=(√7+3-127
=(√7+2)(√7-2)
3
=(√7)²-2²-7-4=3
(3) -3+√6のとき,ェー9の値を求めな
r²-9
=(x+3)(x-3)
=(-3+√6+3)(-3+√6-3)
=√6(-6+√6)
-6√6 +6
=-6√646
(4) x=√5-4のとき, +8+16 の値を求
めなさい。
⇒ r²+8r+16
=121
(8) x=9+√6, y-9-
x2-2xy+y" の値を
x²-2xy+y²
=(x-y)²
=(9+√6-9+√24
=(√6 +2√6) ²
=(3√6)²=54
(9) x=6+√12, y=
x²-4xy+4y² fill
→x²-4xy+4y²
=(x-2y)²
={6+√12-2(-2
Answers
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