2x-15=11-(-6)
tìm x
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5^x + 5^ ( x + 2 ) = 650
5x + 5x . 52 = 650
5x .( 1 + 25 ) = 650
5x . 26 = 650
5x = 650 : 26
5x = 25
5x = 52
=> x = 2
Vậy x = 2
7x-2x=6^17:6^15+44:11
=>2x=6^(17-15)+4
=>2x=6^2+4
=>2x=36+4
=>2x=40
=>x=40:2
=>x=20
Tìm x biết:
a,x-5/7=1/9
b,2x/5=6/2x+1
c,11/8+13/6=85/x
d,2x-2/11=1.1/5
e,x/15=3/5+-2/3
f,x/182=-6/14.35/91
\(7x-2x=6^{17}:6^{15}+44:11\)
\(\Rightarrow5x=6^2+4\)
\(\Rightarrow5x=36+4=40\)
\(\Rightarrow x=40:5\)
\(\Rightarrow x=8\)
a)\(\left(\frac{9}{2}-2x\right)\left(\frac{-11}{2}\right)=\frac{-11}{15}\)
\(-\frac{99}{4}-\left(-11x\right)=\frac{-11}{15}\)
\(-\frac{99}{4}+11x=\frac{-11}{15}\)
\(11x=\frac{-11}{15}-\left(-\frac{90}{4}\right)\)
\(11x=\frac{653}{30}\)
\(x=\frac{653}{30}:11\)
\(x=\frac{653}{330}\)
Vậy \(x=\frac{653}{330}\)
b)\(\left(x-\frac{5}{6}\right):\frac{9}{21}=-\frac{7}{5}\)
\(\left(x-\frac{5}{6}\right)=-\frac{7}{5}.\frac{9}{21}\)
\(x-\frac{5}{6}=-\frac{3}{5}\)
\(x=\frac{7}{30}\)
Vậy \(x=\frac{7}{30}\)
c)2x+3x=-15
5x=-15
x=-15:5
x=-3
Vậy x=-3
a) \(6x+15\times8=12\times\left(19-x\right)\)
\(6x+120=228-12x\)
\(6x+120-228+12x=0\)
\(18x-108=0\)
\(18x=108\)
\(x=6\)
b) \(160-\left(35\div x+3\right)\times15=15\)
\(160-\left(35\div x+3\right)=1\)
\(35\div x+3=159\)
\(35\div x=156\)
\(x=\dfrac{35}{156}\)
c) \(2x-\left(1309\div11-19\right)-2=0\)
\(2x-1309\div11-19=2\)
\(2x-119-19=2\)
\(2x-119=21\)
\(2x=140\)
\(x=70\)
d) \(\left(x-7\right)\times\left(2x-16\right)=0\)
\(x-7=0;2x-16=0\)
\(x=7;2x=16\)
\(x=7;x=8\)
2x - 15 = 11 - ( - 6 )
2x - 15 = 17
2x =17 + 15
2x =32
x =32 : 2
x =16
Học tốt nha....!!!
2x-15=15 ;2x=15-15;2x=0;x=0 mỗi dấu chấn phẩy là dấu suy ra