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mik chỉ ghi kết quả thôi nha
vì làm ra dài dòng lw
=> ta có:
x = 7
x = 4
x = 3
x = 4
x = 3
nha bn
5(x-7)=0
=>x-7=0
=>x=0+7
=>x=7
25(x-4)=0
=>x-4=0
=>x=0+4
=>x=4
34(2x-6)=0
=>2x-6=0
=>2x=0+6
=>2x=6
=>x=6:2
=>x=3
2016(3x-12)=0
=>3x-12=0
=>3x=0+12
=>3x=12
=>x=12:3
=>x=4
47(5x-15)=0
=>5x-15=0
=>5x=0+15
=>5x=15
=>x=15:5
=>x=3
\(1)\frac{1}{5}+\frac{2}{11}< \frac{x}{55}< \frac{2}{5}+\frac{1}{55}\)
\(\Rightarrow\frac{11}{55}+\frac{10}{55}< \frac{x}{55}< \frac{22}{55}+\frac{1}{55}\)
\(\Rightarrow\frac{21}{55}< \frac{x}{55}< \frac{23}{55}\)
\(\Rightarrow21< x< 23\)
\(\Rightarrow x=22\)
\(2)\frac{11}{3}+\frac{-19}{6}+\frac{-15}{2}\le x\le\frac{19}{12}+\frac{-5}{4}+\frac{-10}{3}\)
\(\Rightarrow\frac{22}{6}+\frac{-19}{6}+\frac{-45}{6}\le x\le\frac{19}{12}+\frac{-15}{12}+\frac{-40}{12}\)
\(\Rightarrow\frac{22+\left[-19\right]+\left[-45\right]}{6}\le x\le\frac{19+\left[-15\right]+\left[-40\right]}{12}\)
\(=\frac{-42}{6}\le x\le\frac{-36}{12}\)
\(\Rightarrow-7\le x\le-3\)
\(\Rightarrow x\in\left\{-7;-6;-5;-4;-3\right\}\)
ban vt sai dau bai roi phai la
1/2+1/6+1/12+....+1/(x+1).x=2016/2017
1/1.2+1/2.3+1/3.4+.....+1/x.(x+1)=2016/2017
1-1/2+1/2-1/3+......+1/x-1/x+1=2016/2017
1-1/x+1=2016/2017
1/x+1=1-2016/2017
1/x+1=1/2017
=>x+1=2017
=>x=2016
b)
85/8:x+(-4)/17:x+15:51=4/11
85/8:x+(-4)/17:x=13/187
1413/136:x=13/187
x=15543/104
a, Ix-2I*(x-5)<0
lx-2l lớn hơn or bằng 0 nên (x-5)<0 hay x<5
b, Ix-2I*(x-5)>0
lx-2l lớn hơn or bằng 0 nên (x-5)>0 hay x>5
+) -11-|25-x|=(-8).2
-11-|25-x|=-16
|25-x|=5
\(\Leftrightarrow\)\(\orbr{\begin{cases}25-x=5\\25-x=-5\end{cases}}\)\(\Leftrightarrow\)\(\orbr{\begin{cases}x=20\\x=30\end{cases}}\)
Vậy x \(\in\){20;30}
+) 3x2-53=-5
3x2=48
x2=16
x=\(\pm\)4
Vậy x=\(\pm\)4
+) 5x5+12=-148
5x5 = -160
x5= -32
x= -2
Vậy x= -2
+) 3.(-2)x -5 = -101
3.(-2)x = -96
(-2)x = -32
(-2)x= (-2)5
x=5
Vậy x=5
Chúc bạn học tốt
\(-11-\left|25-x\right|=\left(-8\right).2\)
\(\Rightarrow\left|25-x\right|=5\)
\(\Leftrightarrow\orbr{\begin{cases}25-x=5\\25-x=-5\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=20\\x=30\end{cases}}\)
\(3x^2-53=-5\)
\(\Rightarrow3x^2=48\)
\(\Rightarrow x^2=16\)
\(\Rightarrow x=\pm4\)
\(5x^5+12=-148\)
\(5x^5=-160\)
\(\Rightarrow x^5=-32\)
\(\Rightarrow x=-2\)
\(3\left(-2\right)^x-5=-101\)
\(\Rightarrow3.\left(-2\right)^x=-96\)
\(\Rightarrow\left(-2\right)^x=-32=\left(-2\right)^5\)
\(\Rightarrow x=5\)