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Lời giải:
$x-\frac{31}{15}.\frac{26}{47}=\frac{-57}{15}.\frac{31}{47}-\frac{31}{15}:\frac{-141}{31}$
$x=\frac{-57}{47}.\frac{31}{15}-\frac{31}{15}.\frac{-31}{141}+\frac{31}{15}.\frac{26}{47}$
$x=\frac{31}{15}(\frac{-57}{47}-\frac{-31}{141}+\frac{26}{47})$
$x=\frac{31}{15}.\frac{-62}{141}=\frac{-1922}{2115}$
\(x.\frac{2}{3}+x.\frac{1}{5}=\frac{26}{15}\)
\(x.\left(\frac{2}{3}+\frac{1}{5}\right)=\frac{26}{15}\)
\(x.\frac{13}{15}=\frac{26}{15}\)
\(x=\frac{26}{15}:\frac{13}{15}\)
vậy x=2
hok tốt nha!
v
\(x.\frac{2}{3}+x.\frac{1}{5}=\frac{26}{15}\)
\(x.\left(\frac{2}{3}+\frac{1}{5}\right)=\frac{26}{15}\)
\(x.\frac{13}{15}=\frac{26}{15}\)
\(x=\frac{26}{15}:\frac{13}{15}\)
\(x=2\)
Nhầm, làm lại nhé!
\(\frac{x}{13}+\frac{15}{26}=\frac{46}{52}\)
\(\frac{x}{13}+\frac{15}{26}=\frac{23}{26}\)
\(\frac{x}{13}=\frac{23}{26}-\frac{15}{26}\)
\(\frac{x}{13}=\frac{23}{26}-\frac{15}{26}\)
\(\frac{x}{13}=\frac{4}{13}\)
\(\Rightarrow x=\frac{13.4}{13}=4\)
Vậy \(x=4\)
a: -26-(x-7)=0
=>x-7=-26
=>x=-26+7=-19
b: \(24-\left(30+x\right)=-7\)
=>\(30+x=24-\left(-7\right)\)
=>\(x+30=24+7=31\)
=>x=31-30=1
c: \(3-\left(17-x\right)=-12\)
=>\(17-x=3-\left(-12\right)\)
=>\(17-x=3+12=15\)
=>x=17-15=2
d: \(\left(5-x\right)-7=-15\)
=>\(5-x=-15+7=-8\)
=>\(x=5-\left(-8\right)=5+8=13\)
a) x + 10 = 20
<=> x = 20 - 10 = 10
Vậy x = 10
b) 2x + 15 = 35
<=> 2x = 35 - 15 = 20
<=> x = 10
Vậy x = 10
c) 3(x + 2) = 15
<=> x + 2 = 15 : 3 = 5
<=> x = 5 - 2 = 3
Vậy x = 3
d) 10x + 15.11 = 20.10
<=> 10x + 165 = 200
<=> 10x = 200 - 165 = 35
<=> x = 35 : 10 = 3,5
Vậy x = 3,5
e) 4(x + 2) = 3.4
<=> x + 2 = 3
<=> x = 3 - 2 = 1
Vậy x = 1
f) 33x + 135 = 26.9
<=> 33x + 135 = 234
<=> 33x = 234 - 135 = 99
<=> x = 99 : 33 = 3
Vậy x = 3
g) 2x + 15 + 16 + 17 = 100
<=> 2x + 48 = 100
<=> 2x = 100 - 48 = 52
<=> x = 52 : 2 = 26
Vậy x = 26
h) 2(x + 9 + 10 + 11) = 4.12.5
<=> x + 30 = 120
<=> x = 120 - 30 = 90
Vậy x = 90
1, -15 + \(x\) = -14 - (-57)
-15 + \(x\) = -14 + 57
\(x\) = -14 + 57 + 15
\(x\) = 43 + 15
\(x\) = 58
2, (-14) + \(x\) - 7 = -10
-14 + \(x\) - 7 = -10
- 21 + \(x\) = - 10
\(x\) = -10 + 21
\(x\) = 11
=26/15;-26/15 nha bạn