Mathematics
Junior High
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2² - 3 - 4 ²2² - #7 + 1
(7) 5%の食塩水 200gに,12%の食塩水
(x+x)(x+2)
2
x² - 4x-2=0
91182
gを加えると10%の食塩水になる。
42 √ (6-** (x(-2)
281
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