a) | x - \(\frac{1}{2}\)| + I y + \(\frac{3}{2}\)| + | 7 - \(\frac{5}{2}\)| bé hơn hoặc bằng 0
b) | 2x - 3 | + | 2x + 4 | = 7
c) | x + \(\frac{11}{17}\)+ | x + \(\frac{2}{17}\)| + | x + \(\frac{4}{17}\)| = 4x
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tìm x biết :a) left(x+frac{1}{2}right).left(frac{2}{3}-2xright)0b) left(x.6frac{2}{7}+frac{3}{7}right).2frac{1}{5}-frac{3}{7}-2c) x.3frac{1}{4}+left(-frac{7}{6}right).x-1frac{2}{3}frac{5}{12}d) 5frac{8}{17}:x+left(-frac{4}{17}right):x+3frac{1}{7}:17frac{1}{3}frac{4}{11}e) frac{17}{2}-left|2x-frac{3}{4}right|-frac{7}{4}
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tìm x biết :
a) \(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
b) \(\left(x.6\frac{2}{7}+\frac{3}{7}\right).2\frac{1}{5}-\frac{3}{7}=-2\)
c) \(x.3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
d) \(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
e) \(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
a) (x + 1/2) . (2/3 − 2x) = 0
\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{1}{2}=0\\\frac{2}{3}-2x=0\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=-\frac{1}{2}\\2x=\frac{2}{3}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=-\frac{1}{2}\\x=\frac{1}{3}\end{array}\right.\)
b) \(\left(x.6\frac{2}{7}+\frac{3}{7}\right).2\frac{1}{5}-\frac{3}{7}=-2\)
\(\Rightarrow\left(x.\frac{44}{7}+\frac{3}{7}\right).\frac{11}{5}=-2+\frac{3}{7}\)
\(\Rightarrow\left(x.\frac{44}{7}+\frac{3}{7}\right).\frac{11}{5}=-\frac{11}{7}\)
\(\Rightarrow x.\frac{44}{7}+\frac{3}{7}=-\frac{11}{7}:\frac{11}{5}=-\frac{11}{7}.\frac{5}{11}\)
\(\Rightarrow x.\frac{44}{7}+\frac{3}{7}=-\frac{5}{7}\)
\(\Rightarrow x.\frac{44}{7}=-\frac{5}{7}-\frac{3}{7}\)
\(\Rightarrow x.\frac{44}{7}=-\frac{8}{7}\)
\(\Rightarrow x=-\frac{8}{7}:\frac{44}{7}=-\frac{8}{7}.\frac{7}{44}\)
\(\Rightarrow x=-\frac{2}{11}\)
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c) \(x.3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
\(\Rightarrow x\left(3\frac{1}{4}-\frac{7}{6}\right)=\frac{5}{12}+\frac{5}{3}\)
\(\Rightarrow x\left(\frac{13}{4}-\frac{7}{6}\right)=\frac{25}{12}\)
\(\Rightarrow x.\frac{25}{12}=\frac{25}{12}\)
\(\Rightarrow x=\frac{25}{12}:\frac{25}{12}\)
\(\Rightarrow x=1\)
d) \(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
\(\Rightarrow\left(5\frac{8}{17}-\frac{4}{17}\right):x+\frac{22}{7}:\frac{52}{3}=\frac{4}{11}\)
\(\Rightarrow5\frac{4}{17}:x+\frac{33}{182}=\frac{4}{11}\)
\(\Rightarrow\frac{89}{17}:x=\frac{4}{11}-\frac{33}{182}\)
\(\Rightarrow\frac{89}{17}:x=\frac{365}{2002}\)
\(\Rightarrow x=\frac{89}{17}:\frac{365}{2002}\)
\(\Rightarrow x\approx28,7\) (số hơi lẻ)
e) \(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
\(\Rightarrow\left|2x-\frac{3}{4}\right|=\frac{17}{2}+\frac{7}{4}\)
\(\Rightarrow\left|2x-\frac{3}{4}\right|=\frac{41}{4}\)
\(\Rightarrow\left[\begin{array}{nghiempt}2x-\frac{3}{4}=\frac{41}{4}\\2x-\frac{3}{4}=-\frac{41}{4}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}2x=11\\2x=-\frac{19}{2}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{11}{2}\\x=-\frac{19}{4}\end{array}\right.\)
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Phạm Tuấn Kiệt câu a sao nhìn không đc vậy ???
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a) | x - frac{1}{2}| + I y + frac{3}{2} | + | 7 - frac{5}{2} | bé hơn hoặc bằng 0b) | 2x - 3 | + | 2x + 4 | 7c) | x + frac{11}{17} + | x + frac{2}{17} | + | x + frac{4}{17} | 4x - Mấy bạn giải giúp mình nha !!
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a) | x - \(\frac{1}{2}\)| + I y + \(\frac{3}{2}\) | + | 7 - \(\frac{5}{2}\) | bé hơn hoặc bằng 0
b) | 2x - 3 | + | 2x + 4 | = 7
c) | x + \(\frac{11}{17}\) + | x + \(\frac{2}{17}\) | + | x + \(\frac{4}{17}\) | = 4x
- Mấy bạn giải giúp mình nha !!
Bài 1: A0,7 . 2frac{2}{3}. 20 . 0,375 . frac{5}{28}B( 9,75 .21frac{3}{7} + frac{39}{4}. 18frac{4}{7}) Bài 2a)(x + frac{1}{2}) . (frac{2}{3}- 2x ) 0b)frac{2}{3}x-frac{1}{2}xfrac{5}{12}c) x .3frac{1}{4}+left(-frac{7}{6}right).x-1frac{2}{3}frac{5}{12}d)5frac{8}{17}:x+left(frac{-4}{17}right):x+3frac{1}{7}:17frac{1}{3} frac{4}{11}
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Bài 1:
A=0,7 . \(2\frac{2}{3}\). 20 . 0,375 . \(\frac{5}{28}\)
B=( 9,75 .\(21\frac{3}{7}\) + \(\frac{39}{4}\). \(18\frac{4}{7}\))
Bài 2
a)(x + \(\frac{1}{2}\)) . (\(\frac{2}{3}\)- 2x ) = 0
b)\(\frac{2}{3}x-\frac{1}{2}x=\frac{5}{12}\)
c) x .\(3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
d)\(5\frac{8}{17}:x+\left(\frac{-4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}\)= \(\frac{4}{11}\)
bài 2: Tính hai cạnh góc vuông của một tâm giác vuông có độ dài cạnh huyền 37m và diện tích 210m^2
bài 3: giải hệ pt sau:
a. left{{}begin{matrix}frac{x-y}{7}+frac{2x+y}{17}7frac{4x+y}{5}+frac{y-7}{19}15end{matrix}right.
b. left{{}begin{matrix}5left(x+2yright)-3left(x-yright)99x-y7left(x-yright)+3y17end{matrix}right.
c. frac{x}{x-1}-frac{2sqrt{2}}{1-x}-frac{6+sqrt{2}}{x^2-1} 0
d. left{{}begin{matrix}frac{2}{x+3}-frac{5}{y-2}1frac{x+4}{x+3}+frac{y}{y-2}2end{matrix}right.
e. left{{}begin{ma...
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bài 2: Tính hai cạnh góc vuông của một tâm giác vuông có độ dài cạnh huyền = 37m và diện tích = 210\(m^2\)
bài 3: giải hệ pt sau:
a. \(\left\{{}\begin{matrix}\frac{x-y}{7}+\frac{2x+y}{17}=7\\\frac{4x+y}{5}+\frac{y-7}{19}=15\end{matrix}\right.\)
b. \(\left\{{}\begin{matrix}5\left(x+2y\right)-3\left(x-y\right)=99\\x-y=7\left(x-y\right)+3y=17\end{matrix}\right.\)
c. \(\frac{x}{x-1}-\frac{2\sqrt{2}}{1-x}-\frac{6+\sqrt{2}}{x^2-1}\)= 0
d. \(\left\{{}\begin{matrix}\frac{2}{x+3}-\frac{5}{y-2}=1\\\frac{x+4}{x+3}+\frac{y}{y-2}=2\end{matrix}\right.\)
e. \(\left\{{}\begin{matrix}\frac{x-y}{7}+\frac{2x+y}{17}=7\\\frac{4+y}{5}+\frac{y-7}{19}=15\end{matrix}\right.\)
1.tìm x
\(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
\(x.3\frac{1}{4}+\left(\frac{-7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
\(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
\(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
x = -1/2 hoặc 1/3
x= 1
x= chưa ra
x= 2/5 hoặc -4/5
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Tìm x
a)\(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
b)\(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
a) \(1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):\left(-16\frac{2}{3}\right)=0\)
b) \(\left(\frac{x}{3}-5\frac{1}{4}\right)^2-\frac{-2}{5}=1\frac{1}{25}\)
c) \(\frac{17-x}{12}=\frac{3}{17-x}\)
d) \(1\frac{1}{3}-25\%\left(x-\frac{8}{3}\right)+2x=1,6:\frac{3}{5}\)
5)left(2frac{4}{5}x-50right):frac{2}{3}51 6)5frac{8}{17}:x+left(-frac{4}{17}right):x+3frac{1}{7}:17frac{1}{3}frac{4}{11}7)left(x+frac{1}{2}right)cdotleft(frac{2}{3}-2xright)0 8)frac{17}{2}-left|2x-frac{3}{4}right|-frac{7}{4}mọi người giải từng bước chi tiết ra nha mình đang gấp
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5)\(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\) 6)\(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
7)\(\left(x+\frac{1}{2}\right)\cdot\left(\frac{2}{3}-2x\right)=0\) 8)\(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
mọi người giải từng bước chi tiết ra nha mình đang gấp
Giair phương trình sau:
1. (x - 3) (x + 4) (2 - x) (1 - x)
2. frac{2x}{15} - frac{15-2x}{10} frac{7}{6}
3. frac{x}{15} + frac{x+1}{16} + frac{x+2}{17} + frac{x+3}{18} + frac{x+4}{19} 5
4. frac{x+1}{11} + frac{2x-5}{15} frac{3x-47}{17} - frac{4x-59}{19}
5. x2 + 9x + 20 0
6. x3 + 2x - 3 0
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Giair phương trình sau:
1. (x - 3) (x + 4) = (2 - x) (1 - x)
2. \(\frac{2x}{15}\) - \(\frac{15-2x}{10}\) = \(\frac{7}{6}\)
3. \(\frac{x}{15}\) + \(\frac{x+1}{16}\) + \(\frac{x+2}{17}\) + \(\frac{x+3}{18}\) + \(\frac{x+4}{19}\) = 5
4. \(\frac{x+1}{11}\) + \(\frac{2x-5}{15}\) = \(\frac{3x-47}{17}\) - \(\frac{4x-59}{19}\)
5. x2 + 9x + 20 = 0
6. x3 + 2x - 3 = 0
5:x^2 +4x +5x + 20 =0
(x^2 + 4x).(5x+20)
x(x+4).5(x+4)
(x+4).(x+5)
[x+5=0 ->x=-5
[x+4=0 ->x=-4
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