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\(10098:123=82,09756098\)
\(\Rightarrow\)Phép chia này ko chia hết , đơn giản là vì 123 ko fai là Ư( 10098) hay nói cách khác là 10098 ko là là B(123)
Chúc pn hok tốt :)
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1/ 10(X-7)-8(X+5)=6(-5)+24
10x - 70 - 8x - 40 = -30 +24
2x - 110 = -6
2x = 104
x=52
2/ 8(X-|-7|)-6(X-2)=|-8|.6-50
8(x - 7) - 6(x-2) = 8.6 - 50
8x - 56 - 6x +12 =48 -50
2x - 44 = -2
2x = 42
x=21
3/ 2(4X-8)-7(3+X)=|-4|(3-2)
8x-16 - 21 - 7x = 4.1
x-37=4
x=41
4/ 12(X-4)=6(x-2)-16(X+3)=7|-4|
12x - 48 = 6x - 12 - 16x -48 =7.4
12x - 48 = 28
12x=76
x=19/3
5/ 4(X-5)-7(5-X)+10(5-X)=-3
4x - 20 -35 +7x + 50 -10x = -3
x - 5 = -3
x = -2
Chúc bạn học tốt!
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\(a)5\left(3-2x\right)+5\left(x-4\right)=6-4x\)
\(\Leftrightarrow5\left(3-2x+x-4\right)=6-4x\)
\(\Leftrightarrow5\left(-x-1\right)=6-4x\)
\(\Leftrightarrow-5x-5=6-4x\)
\(\Leftrightarrow-x=11\Leftrightarrow x=-11\)
Vậy \(x=-11\)
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1) |x + 2| = 4
\(\Leftrightarrow\orbr{\begin{cases}x+2=4\\x+2=-4\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=2\\x=-6\end{cases}}\)
2) 3 – |2x + 1| = (-5)
\(\Leftrightarrow\left|2x+1\right|=8\Leftrightarrow\orbr{\begin{cases}2x+1=8\\2x+1=-8\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{7}{2}\\x=\frac{-9}{2}\end{cases}}\)
3) 12 + |3 – x| = 9
\(\Leftrightarrow\left|3-x\right|=-3\)(vô lí)
=>\(x=\varnothing\)
1) I x+2 I=4
\(\Rightarrow\orbr{\begin{cases}x+2=4\\x+2=-4\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-6\end{cases}}}\)
2) \(3-|2x+1|=-5\)
\(\Leftrightarrow|2x+1|=8\)
\(\Leftrightarrow\orbr{\begin{cases}2x+1=8\\2x+1=-8\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=7\\2x=-9\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{7}{2}\\x=\frac{-9}{2}\end{cases}}}\)
3) \(12+|3-x|=9\)
\(\Leftrightarrow|3-x|=-3\)(vô lí vì I 3-x I \(\ge\)0)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :1.2+2.4+3.6+4.8+5.10/3.4+6.8+9.12+12.16+15.20=[1.2(1+4+9+...+25)]/[3.4(1+4+9+16)]
=(1.2)/(3.4)=2/12=1/6
CHÚC BẠN HỌC TỐT!!
cho tớ nhé!!!!
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ta có:
=2(\(\frac{2}{2.4}\)+ \(\frac{2}{4.6}\) +\(\frac{2}{6.8}\) +..........+\(\frac{4}{2008.2010}\))
=2(1-\(\frac{1}{4}\)+ \(\frac{1}{4}\)-\(\frac{1}{6}\)+\(\frac{1}{6}-\frac{1}{8}+......+\frac{1}{2008}-\frac{1}{2010}\))
=2(\(1-\frac{1}{2018}\)) Rồi lấy 2 nhân cho kết quả trong dấu ngoặc là ra nhé
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3/4 : 6/x : 8/7 = 3/8 : 4/5 : 6/7
3/4 :8/7 :6/x = 15/32 :6/7
21/32 : 6/x = 35/64
6/x = 21/32 : 35/64
6/x=6/5
=>x=6
ủng hộ nha
Sai đề ạ!
\(4+6+8+...+x=10098\)
\(\Leftrightarrow\frac{\left[\left(x-4\right):2+1\right]\left(x+4\right)}{2}=10098\)
\(\Leftrightarrow\left(\frac{x-4}{2}+1\right)\left(x-4\right)=20196\)
\(\Leftrightarrow\left(\frac{x-4}{2}\right)\left(x-4\right)+x-4=20196\)
\(\Leftrightarrow\frac{x^2-8x+16}{2}+x-4=20196\)
\(\Leftrightarrow\frac{x^2-8x+16}{2}+\frac{2x-8}{2}=20196\)
\(\Leftrightarrow x^2-8x+16+2x-8=40392\)
\(\Leftrightarrow x^2-6x+8=40392\)
\(\Leftrightarrow\left(x-3\right)^2-1=40392\)
\(\Leftrightarrow\left(x-3\right)^2=40393\)
Sai đề rồi