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\(TH1:x\ge0\)
\(\Rightarrow35-3x=5\left(2^3-4\right)\)
\(\Rightarrow35-3x=20\)
\(\Rightarrow3x=35-20\)
\(\Rightarrow3x=15\)
\(\Rightarrow x=5\left(tm\right)\)
\(TH2:x< 0\)
\(\Rightarrow35-3\left(-x\right)=5\left(2^3-4\right)\)
\(\Rightarrow35+3x=20\)
\(\Rightarrow3x=20-35\)
\(\Rightarrow3x=-15\)
\(\Rightarrow x=-5\left(tm\right)\)
Vậy \(S=\left\{5;-5\right\}\)
35 - 3|x| =5(8-4)
35-3|x|=5.4
35-3|x|=20
-3|x|=20-35
-3|x|=-15
|x|=-15: (-3)
|x|=5
\(\Rightarrow\orbr{\begin{cases}x=5\\x=-5\end{cases}}\)
Vậy \(x\in\left\{5;-5\right\}\)
a) |x-3|=7
vì x<3=>x-3<0
=>|x-3|=3-x
=>3-x=7
=>x=4
b) x+|2-x|=6
vì x>2=>2-x<0
=>|2-x|=x-2
=>x+x-2=6
=>x=4
3 ( x - 2 ) - 150 = 24
( x - 2 ) - 150 = 24 : 3
( x - 2 ) - 150 = 8
x - 2 = 8 + 150
x - 2 = 158
x = 158 + 2
x = 160
Answer : 160
3/5 + x = 2/35 - 2/7
3/5 + x = -1/5
=> x = -1/5 - 3/5
=> x = -4/5
\(\frac{3}{35}-\left(\frac{3}{5}+x\right)=\frac{2}{7}\)
\(\frac{3}{5}+x=\frac{3}{35}-\frac{2}{7}\)
\(\frac{3}{5}+x=-\frac{1}{5}\)
\(x=-\frac{1}{5}-\frac{3}{5}\)
\(x=-\frac{4}{5}\)
#ủng_hộ_vs_ạ
#thanks_nhiều
\(a,x:\left(-\frac{15}{28}\right)=\frac{21}{35}\)
\(x=\frac{21}{35}\times\left(-\frac{15}{28}\right)\)
\(x=-\frac{9}{28}\)
\(b,x-\frac{1}{42}=-\frac{6}{7}\times\frac{5}{7}\)
\(x-\frac{1}{42}=-\frac{30}{49}\)
\(x=-\frac{30}{49}+\frac{1}{42}\)
\(x=-\frac{173}{294}\)
\(c,\left(x-\frac{3}{4}\right):\frac{7}{5}=-\frac{1}{4}\)
\(x-\frac{3}{4}=-\frac{1}{4}\times\frac{7}{5}\)
\(x-\frac{3}{4}=-\frac{7}{20}\)
\(x=-\frac{7}{20}+\frac{3}{4}\)
\(x=\frac{2}{5}\)
a)x:-15/28=21/35
x=21/35.-15/28
x=-9/28
b)x-1/42= -6/7.5/7
x-1/42= -6/7.5/7
x-1/42=-30/49
x=-30/49+1/42
x=-173/294
c)(x-3/4):7/5=-1/4
x-3/4=-1/4.7/5
x-3/4=-7/20
x=-7/20+3/4
x=2/5
có gì sai xin tha thứ giùm nha!
hi hi!!!
35 – 3(x + 2) = 5
3(x + 2) = 35 - 5
3(x + 2) = 30
x + 2 = 30 : 3
x + 2 = 10
x = 10 - 2
x = 8
35-3(x+2)=5
3(x+2)=35-5
3(x+2)=30
x+2=30:3
x+2=10
x=10-2
x=8
Vậy x=8
HT