câu 1 chỗ kết luận thêm nghiệm x=5 mik quên mất
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Bài 1: Tính:
Aleft(-2right).left(-3right)-5.left|-5right|+125.left(dfrac{-1}{5}right)^2
Bleft(-3right).left|-7right|-left(-4right).left|5right|+dfrac{1}{3}.left|-9right|
Cleft(-2right)^3.left|-3right|-dfrac{1}{5}.left|-25right|-4.left|-7right|+left(-2right)^2
Dleft(-6right).left|-3right|+2.left|-9right|-7left|left(-2right)^3right|+8.left|-7right|
Eleft|-3^2right|.left|4right|-left|7right|.8-left|6right|.left|-8right|-left|12right|.left(dfrac{1}{2}right)^2
Bài 2: Tìm x:
a)12-2left|3x+2rig...
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Bài 1: Tính:
A=\(\left(-2\right).\left(-3\right)-5.\left|-5\right|+125.\left(\dfrac{-1}{5}\right)^2\)
B=\(\left(-3\right).\left|-7\right|-\left(-4\right).\left|5\right|+\dfrac{1}{3}.\left|-9\right|\)
C=\(\left(-2\right)^3.\left|-3\right|-\dfrac{1}{5}.\left|-25\right|-4.\left|-7\right|+\left(-2\right)^2\)
D=\(\left(-6\right).\left|-3\right|+2.\left|-9\right|-7\left|\left(-2\right)^3\right|+8.\left|-7\right|\)
E=\(\left|-3^2\right|.\left|4\right|-\left|7\right|.8-\left|6\right|.\left|-8\right|-\left|12\right|.\left(\dfrac{1}{2}\right)^2\)
Bài 2: Tìm x:
a)\(12-2\left|3x+2\right|=10\)
b)\(2.\left|5-4x\right|+17=\left(-2\right)^3.\left(-4\right)\)
c)\(\left|3x-5\right|+\left(-3\right)^2.2=12.\left|3x+5\right|+117\)
d)\(4.\left|3-2x\right|+\left(-5\right).\left|4-3x\right|-5=-6\)
e)\(\left|2x-7\right|-2^3.\left|2x-7\right|+15=-5.\left|2x-7\right|+3\)
f)\(\left|x+2\right|+\left|x^2-4\right|=0\)
g)\(\left|3x-9\right|+\left|x^2-9\right|=0\)
h)\(\left|2x-1\right|+\left|x^2-\dfrac{1}{4}\right|=0\)
tìm x biết
left(3dfrac{1}{2}+2xright).2dfrac{2}{3}5dfrac{1}{3}
dfrac{3}{4}-2.left|2x-dfrac{2}{3}right|2
left(0.6-dfrac{1}{2}right).dfrac{3}{4}-left(-1right)dfrac{1}{3}
left(3x-1right).left(-dfrac{1}{2}x+5right)0
dfrac{1}{4}+dfrac{1}{3}:left(2x-1right)-5
left(2x+dfrac{3}{5}right)^2-dfrac{9}{25}0
-5.left(x+dfrac{1}{5}right)-dfrac{1}{2}.left(x-dfrac{2}{3}right)dfrac{3}{2}x-dfrac{5}{6}
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tìm x biết
\(\left(3\dfrac{1}{2}+2x\right).2\dfrac{2}{3}=5\dfrac{1}{3}\)
\(\dfrac{3}{4}-2.\left|2x-\dfrac{2}{3}\right|=2\)
\(\left(0.6-\dfrac{1}{2}\right).\dfrac{3}{4}-\left(-1\right)=\dfrac{1}{3}\)
\(\left(3x-1\right).\left(-\dfrac{1}{2}x+5\right)=0\)
\(\dfrac{1}{4}+\dfrac{1}{3}:\left(2x-1\right)=-5\)
\(\left(2x+\dfrac{3}{5}\right)^2-\dfrac{9}{25}=0\)
\(-5.\left(x+\dfrac{1}{5}\right)-\dfrac{1}{2}.\left(x-\dfrac{2}{3}\right)=\dfrac{3}{2}x-\dfrac{5}{6}\)
Tìm số nguyên x
1/ 17x+3left(-16x-37right)2x+43-4x
2/ -2x-3left(x-17right)34-2left(-x+25right)
3/ left{-3x+2left[45-x-3left(3x+7right)-2xright]+4xright}55-103-57:left[-2left(2x-1right)^2-left(-9right)^0right]-106
4/ -2x+3left{12-2left[3x-left(20+2xright)-4xright]+1right}45
5/ 3x-32-5+1
6/ 15+4x 2x-145
7/ -3left(2x+5right)-16 -4left(3-2xright)
8/ -2x+15 3x-7 19-x
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Tìm số nguyên x
1/ \(17x+3\left(-16x-37\right)=2x+43-4x\)
2/ \(-2x-3\left(x-17\right)=34-2\left(-x+25\right)\)
3/ \(\left\{-3x+2\left[45-x-3\left(3x+7\right)-2x\right]+4x\right\}=55-103-57:\left[-2\left(2x-1\right)^2-\left(-9\right)^0\right]=-106\)
4/ \(-2x+3\left\{12-2\left[3x-\left(20+2x\right)-4x\right]+1\right\}=45\)
5/ \(3x-32>-5+1\)
6/ \(15+4x< 2x-145\)
7/ \(-3\left(2x+5\right)-16< -4\left(3-2x\right)\)
8/ \(-2x+15< 3x-7< 19-x\)
tìm x biết
a) \(\dfrac{2x-3}{3}+-\dfrac{3}{2}=\dfrac{5-2x}{6}-\dfrac{1}{2}\)
b) \(\left(3x-\dfrac{1}{2}\right).\left(3-\dfrac{1}{2}x\right).\left(1+\dfrac{3}{4}:x\right)=0\)
c) \(\left(3-\dfrac{9}{10}-|x+2|\right):\left(\dfrac{19}{20}-1-\dfrac{2}{3}\right)+\dfrac{4}{5}=1\)
left(2x-3right)left(6-2xright)0
dfrac{1}{3}x+dfrac{2}{5}left(x-1right)0
left(3x-1right)left(-dfrac{1}{2}x+5right)0
dfrac{x}{5}dfrac{2}{3}
dfrac{x}{3}-dfrac{1}{2}dfrac{1}{5}
dfrac{x}{5}-dfrac{1}{2}dfrac{6}{10}
dfrac{x+3}{15}dfrac{1}{3}
dfrac{x-12}{4}dfrac{1}{2}
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\(\left(2x-3\right)\left(6-2x\right)=0\)
\(\dfrac{1}{3}x+\dfrac{2}{5}\left(x-1\right)=0\)
\(\left(3x-1\right)\left(-\dfrac{1}{2}x+5\right)=0\)
\(\dfrac{x}{5}=\dfrac{2}{3}\)
\(\dfrac{x}{3}-\dfrac{1}{2}=\dfrac{1}{5}\)
\(\dfrac{x}{5}-\dfrac{1}{2}=\dfrac{6}{10}\)
\(\dfrac{x+3}{15}=\dfrac{1}{3}\)
\(\dfrac{x-12}{4}=\dfrac{1}{2}\)
tim x
\(a,\left|\frac{4}{7}-x\right|+\frac{2}{5}=0\)
\(b,6-\left|\frac{1}{4}x+\frac{2}{5}\right|=0\)
\(c,\left|x-\frac{1}{3}\right|+\left|2-\frac{4}{5}\right|=0\)
Tìm \(x\in Z\) biết :
\(a.\left(x-4\right).\left(x-7\right)=0\)
\(b:x.\left(x+3\right)=0\)
\(c:\left(x-2\right)\left(5-x\right)=0\)
\(d:\left(x-1\right).\left(x^2+1\right)=0\)
Tìm x,y biết:
a) \(-\dfrac{1}{2}\left(3-2x\right)-7=5-\dfrac{1}{3}\left(x-\dfrac{4}{5}\right)\)
b)\(\left(5-\dfrac{3x}{2}\right):-1\dfrac{3}{8}=-7\dfrac{1}{3}\)
c)\(\left(2+3x\right)^2+\left|3x+2y\right|=0\)
tìm x thuộc n biết
a) left(x+2right)^52^{10}
b) 5^x:5^2125
c) left(x+1right)^2left(x+1right)^0
d)left(2+xright)+left(4+xright)+left(6+xright)+...+left(52+xright)780
e)70⋮x,80⋮x và x8
f)x⋮12,x⋮25,x⋮30và 0x500
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tìm x thuộc n biết
a) \(\left(x+2\right)^5=2^{10}\)
b) \(5^x:5^2=125\)
c) \(\left(x+1\right)^2=\left(x+1\right)^0\)
d)\(\left(2+x\right)+\left(4+x\right)+\left(6+x\right)+...+\left(52+x\right)=780\)
e)\(70⋮x,80⋮x\) và x>8
f)\(x⋮12,x⋮25,x⋮30\)và 0<x<500