Tìm x , biết 3x-21/9=-9/7-x Mn giúp mik với mik sắp đi học r

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Question

Tìm x , biết
3x-21/9=-9/7-x
Mn giúp mik với mik sắp đi học r

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Môn Toán Ladonna 4 years 2020-10-13T07:40:41+00:00 2020-10-13T07:40:41+00:00 2 Answers 180 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

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King · Answer 1 · 2020-10-13T07:42:19+00:00

King

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2020-10-13T07:42:19+00:00 October 13, 2020 at 7:42 am

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⇔3x-21/9 -( -9/7-x)=0

⇔3x+x-21/9+9/7=0

⇔4x -22/21=0

⇒x=22/21:4=11/42

Eirian · Answer 2 · 2020-10-13T07:42:30+00:00

Tìm x:

3x – $\frac{21}{9}$ = $\frac{9}{7}$ – x

3x + x = $\frac{- 9}{7}$ + $\frac{21}{9}$

4x = $\frac{- 81}{63}$ + $\frac{147}{63}$

4x = $\frac{66}{63}$

x = $\frac{66}{63}$ : 4

x = $\frac{66}{63}$ × $\frac{1}{4}$

x = $\frac{66}{252}$ = $\frac{11}{42}$

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