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<=> x*(1+4+7+...+58)=595
<=> x*((58-1):3+1)*(58+1)=595
<=> x*590=595
<=> x=595:590
<=> x=119/118
Vậy x=119/118
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a)
5 8 x + 2 5 = 1 5 5 8 x = 1 5 − 2 5 5 8 x = − 1 5 x = − 1 5 : 5 8 x = − 1 5 . 8 5 x = − 8 25
b)
5 7 : x + 11 7 = 18 7 5 7 : x = 18 7 − 11 7 5 7 : x = 1 x = 5 7 : 1 x = 5 7
c)
2 x 5 − 1 : − 5 = 1 7 2 x 5 − 1 = 1 7 . − 5 2 x 5 − 1 = − 5 7 2 x 5 = − 5 7 + 1 2 x 5 = 2 5 x = 2 5 : 2 5 x = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
5 8 x + 2 5 = 1 5 5 8 x = 1 5 − 2 5 5 8 x = − 1 5 x = − 1 5 : 5 8 x = − 1 5 . 8 5 x = − 8 25
b)
5 7 : x + 11 7 = 18 7 5 7 : x = 18 7 − 11 7 5 7 : x = 1 x = 5 7 : 1 x = 5 7
c)
2 x 5 − 1 : − 5 = 1 7 2 x 5 − 1 = 1 7 . − 5 2 x 5 − 1 = − 5 7 2 x 5 = − 5 7 + 1 2 x 5 = 2 5 x = 2 5 : 2 5 x = 1
a,\(\frac{5}{8}x+\frac{2}{5}=\frac{1}{5}\)
\(< =>\frac{5}{8}x=\frac{1}{5}-\frac{2}{5}\)
\(< =>\frac{5}{8}x=-\frac{1}{5}\)
\(< =>x=-\frac{1}{5}:\frac{5}{8}=-\frac{8}{25}\)
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x=2
x=103
trên này dùng để hỏi những câu kg bt nha thấy lớp 6 rùi kg bt thui xuống lớp 3 hok lai nha
4x:17 = 0
4x = -17
<=> x= -17/4
7x-8 = 713
7x = 713 + 8
7x = 721
x = 103
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\(1,\Rightarrow3^{x-3}=\left(3^2\right)^8:\left(3^3\right)^5=3^{16}:3^{15}=3^1\\ \Rightarrow x-3=1\\ \Rightarrow x=4\\ 2,\Rightarrow7^x\left(1+7^2\right)=350\\ \Rightarrow7^x=\dfrac{350}{50}=7=7^1\\ \Rightarrow x=1\)
\(3,\Rightarrow2^{2+2x+2}-2^{2x}=240\\ \Rightarrow2^{2x}\left(2^4-1\right)=240\\ \Rightarrow2^{2x}=\dfrac{240}{15}=16=2^4\\ \Rightarrow2x=4\Rightarrow x=2\)
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\(x+4x+7x+...+100x=8585\)
\(\Leftrightarrow x\left(1+4+7+...+100\right)=8585\)
\(\Leftrightarrow\frac{\left(100+1\right)\left[\left(100-1\right)\div3+1\right]}{2}x=8585\)
\(\Leftrightarrow\frac{101.34}{2}x=8585\)
\(\Leftrightarrow101.17x=8585\)
\(\Leftrightarrow1717x=8585\)
\(\Leftrightarrow x=\frac{8585}{1717}\)
\(\Leftrightarrow x=5\)
Vậy x = 5
Ta có : x + 4x + 7x + ...... + 58x = 596
<=> x(1 + 4 + 7 + ...... + 58) = 596
=> x 590 = 596
=> x = 596/590
x + 4x + 7x + ..... + 58x = 596
( x + 4x + 7x + ...+58x) = 596
( x + 58x) x [( 58x - x ) : 3 + 1 ] : 2 = 596
x = 590 = 596
x = 596 : 590
x = 596/590