a , X: 2 = 104 x 2 b , X - 36 +9 =103
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\(\dfrac{x+4}{104}+\dfrac{x+2}{102}=\dfrac{x+3}{103}+\dfrac{x+1}{101}\\ \Leftrightarrow\left(\dfrac{x+4}{104}-1\right)+\left(\dfrac{x+2}{102}-1\right)=\left(\dfrac{x+3}{103}-1\right)+\left(\dfrac{x+1}{101}-1\right)\\ \Leftrightarrow\dfrac{x-100}{104}+\dfrac{x-100}{102}-\dfrac{x-100}{103}-\dfrac{x-100}{101}=0\\ \Leftrightarrow\left(x-100\right)\left(\dfrac{1}{104}+\dfrac{1}{102}-\dfrac{1}{103}-\dfrac{1}{101}\right)=0\\ \Leftrightarrow x-100=0\left(vì.\dfrac{1}{104}+\dfrac{1}{102}-\dfrac{1}{103}-\dfrac{1}{101}\ne0\right)\\ \Leftrightarrow x=100\)
1,a,\(\left|x+2\right|=x+3\Leftrightarrow\orbr{\begin{cases}x+2=x+3\\x+2=-x-3\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x-x=3-2\\x+x=-3-2\end{cases}\Leftrightarrow\orbr{\begin{cases}0=1\left(voly\right)\\x=\frac{-5}{2}\end{cases}}}\)
b, \(|x-2|=2-x\Leftrightarrow\orbr{\begin{cases}x-2=2-x\\x-2=x-2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x+x=2+2\\x-x=-2+2\end{cases}\Rightarrow x=2}\)
c,\(\left|2x-1\right|=3\Leftrightarrow\orbr{\begin{cases}2x-1=3\\2x-1=-3\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=4\\2x=-2\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}}\)
d,\(\left|x-12\right|=x\Leftrightarrow\orbr{\begin{cases}x-12=x\\x-12=-x\end{cases}\Leftrightarrow\orbr{\begin{cases}0=12\left(voly\right)\\x=6\end{cases}}}\)
cái này là toán lớp 6 mak!câu c có số nguyên âm nè!!!!!!!!!!
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
\(\dfrac{x-2}{102}+\dfrac{x-3}{103}=\dfrac{x-4}{104}+\dfrac{x-5}{105}\)
\(\Leftrightarrow\dfrac{x-2}{102}+1+\dfrac{x-3}{103}+1=\dfrac{x-4}{104}+1+\dfrac{x-5}{105}+1\)
\(\Leftrightarrow\dfrac{x+100}{102}+\dfrac{x+100}{103}-\dfrac{x+100}{104}-\dfrac{x+100}{105}=0\)
\(\Leftrightarrow\left(x+100\right)\left(\dfrac{1}{102}+\dfrac{1}{103}-\dfrac{1}{104}-\dfrac{1}{105}\right)=0\)
\(\Leftrightarrow x+100=0\Leftrightarrow x=-100\)
a. X : 2 = 104 x 2
=> X : 2 = 208
=> X = 208 x 2
=> X = 416
Vậy X = 416
b. X - 36 + 9 = 103
=> X - 27 = 103
=> X = 103 + 27
=> X = 130
Vậy X = 130
a,x : 2 = 104 x 2
<=> x : 2 = 208
<=> x = 208 x 2 = 416
b,x - 36 + 9 = 103
<=> x = 103 + 36 - 9
<=> x = 130