tim so nguyen x biet
x-(-7)=0
18 – x = -8 – (-13)
x + 29 = I-43I+(-43)
15-IxI=10
I10-xI-17=-7
tim so nguyen x biet x-(-7)=0 18 – x = -8 – (-13) x + 29 = I-43I+(-43) 15-IxI=10 I10-xI-17=-7
By Madelyn
By Madelyn
tim so nguyen x biet
x-(-7)=0
18 – x = -8 – (-13)
x + 29 = I-43I+(-43)
15-IxI=10
I10-xI-17=-7
Đáp án:
e) \(\left[ \begin{array}{l}
x = 0\\
x = 20
\end{array} \right.\)
Giải thích các bước giải:
\(\begin{array}{l}
a)x + 7 = 0\\
\to x = – 7\\
b)18 – x = – 8 + 13\\
\to 18 – x = 5\\
\to x = 13\\
c)x + 29 = 43 – 43\\
\to x + 29 = 0\\
\to x = – 29\\
d)15 – \left| x \right| = 10\\
\to \left| x \right| = 5\\
\to \left[ \begin{array}{l}
x = 5\\
x = – 5
\end{array} \right.\\
e)\left| {10 – x} \right| = 17 – 7\\
\to \left| {10 – x} \right| = 10\\
\to \left[ \begin{array}{l}
10 – x = 10\\
10 – x = – 10
\end{array} \right.\\
\to \left[ \begin{array}{l}
x = 0\\
x = 20
\end{array} \right.
\end{array}\)
Đáp án:x-(-7)=0
x =0-(-7)
x =0+(+7)
x =7
18 – x= -8 – (-13)
18 – x= -8 + (+13)
18 – x= 13 – 8
18 – x=5
x=18 – 5
x=13
x + 29 = I-43I+(-43)
x + 29 = 43 + (-43)
x + 29 = 0
x =0 – 29
x =0 + (-29)
x =(-29)
Giải thích các bước giải: