數學題化簡Y^2 81

👨🏻‍🏫 學術台數學

★小星星☆

2007-10-29 4:50 pm

wt is ans

回答 (4)

jaja_s8i

2007-10-29 10:02 pm

✔ 最佳答案

Y^2=81 make the exponent the same
Y^2=9^2
therefore, Y=9

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ちゃん

2007-10-29 8:07 pm

你係講(y^2)(81) 定 y^2 = 81 定 (y^2)-81 呀?
(y^2)(81)
=(y^2)(9^2)
=(9y)^2

y^2=81
y^2=9^2
y=2

(y^2)-81
=(y^2)-9^2
=(y-9)(y+9)

參考: 自己-_-

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Tiro

2007-10-29 5:43 pm

if y^2=81

then,y=9,-9

I hope this answer can help you.

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死肥鴨

2007-10-29 5:23 pm

y^2 = 81
=> y=9

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