Giúp mình với các bạn Question Giúp mình với các bạn in progress 0 Môn Toán Nick 4 years 2021-05-16T06:37:41+00:00 2021-05-16T06:37:41+00:00 2 Answers 9 views 0
Answers ( )
Đáp án:
`a)x=1/10`
`b)x=-9`
`c)` \(\left[ \begin{array}{l}x=\frac{13}{40}\\x=\frac{-77}{40}\end{array} \right.\)
Giải thích các bước giải:
`a)`
`x-3/5=(-1)/2`
`=>x=(-1)/2+3/5`
`=>x=(-5)/10+6/10`
`=>x=1/10`
`c)`
`(x+3)/9=(-2)/3`
`=>x+3=((-2).9)/3=-6`
`=>x=-9`
`b)`
`|x+4/5|=1 7/8`
`=>|x+4/5|=7/8`
`=>`\(\left[ \begin{array}{l}x+\frac{4}{5}=\frac{15}{8}\\x+\frac{4}{5}=\frac{-15}{8}\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=\frac{15}{8}-\frac{4}{5}\\x=\frac{-15}{8}-\frac{4}{5}\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=\frac{45}{40}-\frac{32}{40}\\x=\frac{-45}{40}-\frac{32}{40}\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=\frac{13}{40}\\x=\frac{-77}{40}\end{array} \right.\)
Vậy \(\left[ \begin{array}{l}x=\frac{13}{40}\\x=\frac{-77}{40}\end{array} \right.\)
Đáp án + giải thích bước giải :
`a) x – 3/5 = (-1)/2`
`-> x = (-1)/2 + 3/5`
`-> x = 1/10`
Vậy `x = 1/10`
`b) |x + 4/5| = 1 7/8`
`-> |x + 4/5| = 15/8`
`->` \(\left[ \begin{array}{l}x + \dfrac{4}{5}=\dfrac{15}{8}\\x + \dfrac{4}{5}=\dfrac{-15}{8}\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x=\dfrac{43}{40}\\x=\dfrac{-107}{40}\end{array} \right.\)
Vậy
\(\left[ \begin{array}{l}x=\dfrac{43}{40}\\x=\dfrac{-107}{40}\end{array} \right.\)
`c) (x + 3)/9 = (-2)/3`
`-> (x + 3) . 3 = 9 . (-2)`
`-> (x + 3) . 3 = -18`
`-> x + 3 = -18 : 3`
`->x + 3 = -6`
`-> x = -6 – 3`
`-> x = -9`
Vậy `x = -9`