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4 x ( 2017 - 16x ) = 68
2017 - 16x = 68 : 4 = 17
16x = 2017 - 17 = 2000
x = 2000 : 16 = 125
Ta có :
\(5^{2017}:\left(5^{2015}.16+5^{2015}.9\right)\)\(=5^{2017}:\left[5^{2015}\left(16+9\right)\right]\)
\(=5^{2017}:\left[5^{2015}.5^2\right]=1\)
2/ \(4.\left(2017-16x\right)=10^2-2^5\)
\(\Rightarrow4.2017-4.4^2x=100-25\)
\(\Rightarrow8068-4^3.x=75\)
\(\Rightarrow64x=8068-75\)
\(\Rightarrow64x=7993\)
\(\Rightarrow x=\frac{7993}{64}\)
Ta có: 23x + 2 = 4x + 5
<=> 23x + 2 = (22)x + 5
=> 23x + 2 = 22x + 10
=> 3x + 2 = 2x + 10
=> 3x - 2x = 10 - 2
=> x = 8
a) 100 - 7.(x-5) = 68
7.(x - 5) = 100 - 68 = 32
x - 5 = \(\frac{32}{7}\)
x = \(\frac{32}{7}+5=\frac{67}{7}\)
b) 2(x-6)+2227:17=151
2( x -6) + 131 = 151
2 (x - 6) = 20
x - 6 = 20 : 2 = 10
x = 10 + 6 = 16
a) (x-51)=2.8+20 b) 4.(x-3) = 49-1 c) 2x-49=5.27 d) 9.(x+4)-25=5.4
x-51 =16+20 4.(x-30)=48 2x-49=135 9.(x+4)-25=20
x-51 =36 x-30=48:4 2x =135+49 9.(x+4) =20+25
x = 36+51 x-30= 12 2x =184 9.(x+4) =45
x = 87 x =12+30 x=42 x =184:2 x= 92 x+4 =45:9
x+4 =5
x =5-4 x=1
\(12.x-5^4\div5^2=35\)
\(12.x-5^2=35\)
\(12.x-25=35\)
\(12.x=60\)
\(x=60\div12\)
\(x=5\)
Ta có:
\(12\times x-5^4:5^2=35\)
\(\Leftrightarrow12\times x-5^{4-2}=35\)
\(\Leftrightarrow12\times x-5^2=35\)
\(\Leftrightarrow12\times x-25=35\)
\(\Leftrightarrow12\times x=35+25\)
\(\Leftrightarrow12\times x=60\)
\(\Leftrightarrow x=60\div12\)
\(\Leftrightarrow x=5\)