Bài 4: Giá trị tuyệt đối của một số hữu tỉ. Cộng, trừ, nhân, chia số thập phân
Các câu hỏi tương tự
1. Tìm x:
a) \(\left|3x-5\right|-\left|x+2\right|=0\)
b)\(\left|3x-5\right|+\left|x+2\right|=0\)
c)\(\left|3x-5\right|-x+2=0\)
d)\(\dfrac{11}{2}\le\left|x\right|< \dfrac{17}{2}\)
e)\(\dfrac{11}{2}\le\left|x+2\right|\le\dfrac{17}{2}\)
Tìm x biết:
a) left|x-dfrac{1}{2}right|+left|x+2right|dfrac{3}{4}
b) left(dfrac{2}{3}-2xright).1dfrac{1}{2}dfrac{3}{4}
c) left|x-1right|+2left(x+4right)10
d) dfrac{11}{12}+dfrac{11}{12.23}+...+dfrac{11}{89.100}+x1dfrac{2}{3}
e) left(dfrac{2}{11.13}+dfrac{2}{13.15}+...+dfrac{2}{19.21}right)-x+4dfrac{221}{231}2dfrac{1}{3}
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Tìm x biết:
a) \(\left|x-\dfrac{1}{2}\right|+\left|x+2\right|=\dfrac{3}{4}\)
b) \(\left(\dfrac{2}{3}-2x\right).1\dfrac{1}{2}=\dfrac{3}{4}\)
c) \(\left|x-1\right|+2\left(x+4\right)=10\)
d) \(\dfrac{11}{12}+\dfrac{11}{12.23}+...+\dfrac{11}{89.100}+x=1\dfrac{2}{3}\)
e) \(\left(\dfrac{2}{11.13}+\dfrac{2}{13.15}+...+\dfrac{2}{19.21}\right)-x+4\dfrac{221}{231}=2\dfrac{1}{3}\)
Với giá trị nào của x mỗi biểu thức sau đạt giá trị nhỏ nhất:
a)Aleft|x-3right|+left|x-5right|+left|x-7right|
b)Bleft|x-1right|+left|x-2right|+left|x-3right|+left|x+5right|
c)Cleft|x+1right|+left|x+2right|+left|x+3right|+left|x+4right|+left|x+5right|
d)Dleft|2x+1right|+left|2x+3right|+left|2x+5right|+left|2x+7right|+left|2x+9right|+left|2x+11right|
***** ___ GIÚP MK VS MN ƠI___ MK CẦN GẤP___ *****
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Với giá trị nào của x mỗi biểu thức sau đạt giá trị nhỏ nhất:
\(a)A=\left|x-3\right|+\left|x-5\right|+\left|x-7\right|\)
\(b)B=\left|x-1\right|+\left|x-2\right|+\left|x-3\right|+\left|x+5\right|\)
\(c)C=\left|x+1\right|+\left|x+2\right|+\left|x+3\right|+\left|x+4\right|+\left|x+5\right|\)
\(d)D=\left|2x+1\right|+\left|2x+3\right|+\left|2x+5\right|+\left|2x+7\right|+\left|2x+9\right|+\left|2x+11\right|\)
***** ___ GIÚP MK VS MN ƠI___ MK CẦN GẤP___ *****
Bài 4: Tính hợp lý
a) Aleft(left|frac{-3}{4}right|+left|frac{-2}{5}right|right):frac{3}{7}+left(frac{-3}{5}+left|frac{-1}{4}right|right):frac{3}{7}
b) B2frac{5}{23}-left(frac{-7}{9}right)-left|frac{-5}{23}right|+frac{12}{9}+left|-0,75right|
Bài 5 : Tìm x :
frac{11}{12}-left(frac{2}{5}+xright)left|frac{-2}{3}right|
b) left|xright|:left(frac{1}{9}-frac{2}{5}right)frac{-1}{2}
c) left(x-frac{1}{5}right).left(1frac{3}{5}+2xright)0
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Bài 4: Tính hợp lý
a) \(A=\left(\left|\frac{-3}{4}\right|+\left|\frac{-2}{5}\right|\right):\frac{3}{7}+\left(\frac{-3}{5}+\left|\frac{-1}{4}\right|\right):\frac{3}{7}\)
b) \(B=2\frac{5}{23}-\left(\frac{-7}{9}\right)-\left|\frac{-5}{23}\right|+\frac{12}{9}+\left|-0,75\right|\)
Bài 5 : Tìm x :
\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\left|\frac{-2}{3}\right|\)
b) \(\left|x\right|:\left(\frac{1}{9}-\frac{2}{5}\right)=\frac{-1}{2}\)
c) \(\left(x-\frac{1}{5}\right).\left(1\frac{3}{5}+2x\right)=0\)
\(a.\left|x+2\right|+\left|x-1\right|=3-\left(y+2\right)^2\)
\(b.\left|x-5\right|+\left|1-x\right|=\dfrac{12}{\left|y+1\right|+3}\)
\(c.\left|y+3\right|+5=\dfrac{10}{\left(2x-6\right)^2+2}\)
\(d.\left|x-1\right|+\left|3-x\right|=\dfrac{6}{\left|y-3\right|+3}\)
23 tháng 10 2020 lúc 21:28
Tìm x, biết:
a) \(4\left|3x-1\right|+\left|x\right|-2\left|x-5\right|+7\left|x-3\right|=12\)
b) \(2\left|x+3\frac{1}{2}\right|+\left|x\right|-3\frac{1}{2}=\left|2\frac{1}{5}-x\right|\)
1 , Tìm x,y biết
|x-y|+\(\left|y+\frac{9}{25}\right|\) = 0
2, Tìm x biết
a, \(\left|x+\frac{11}{2}\right|>\left|-5,5\right|\)
b, \(\frac{2}{5}< \left|x-\frac{7}{5}\right|< \frac{3}{5}\)
Câu 1: Tinh
Aleft(dfrac{3}{5}right)^2.5^2-left(2dfrac{1}{4}right)^3:left(dfrac{3}{4}right)^3+dfrac{1}{2}
Bleft[dfrac{4}{11}.left(dfrac{1}{25}right)^0+dfrac{7}{22}.2right]^{2010}-left(dfrac{1}{2^2}:dfrac{8^2}{4^4}right)^{2009}
dfrac{7}{8}.left(dfrac{2}{12}+dfrac{4}{10}right)
dfrac{3}{2}-dfrac{5}{6}:left(dfrac{1}{2}right)^2+sqrt{4}
Câu 2: Tim x
2.x-dfrac{5}{4}dfrac{20}{15}
left(x+dfrac{1}{3}right)^3left(dfrac{-1}{8}right)
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Câu 1: Tinh
\(A=\left(\dfrac{3}{5}\right)^2.5^2-\left(2\dfrac{1}{4}\right)^3:\left(\dfrac{3}{4}\right)^3+\dfrac{1}{2}\)
\(B=\left[\dfrac{4}{11}.\left(\dfrac{1}{25}\right)^0+\dfrac{7}{22}.2\right]^{2010}-\left(\dfrac{1}{2^2}:\dfrac{8^2}{4^4}\right)^{2009}\)
\(\dfrac{7}{8}.\left(\dfrac{2}{12}+\dfrac{4}{10}\right)\)
\(\dfrac{3}{2}-\dfrac{5}{6}:\left(\dfrac{1}{2}\right)^2+\sqrt{4}\)
Câu 2: Tim x
\(2.x-\dfrac{5}{4}=\dfrac{20}{15}\)
\(\left(x+\dfrac{1}{3}\right)^3=\left(\dfrac{-1}{8}\right)\)
Rút gọn:
a, A= \(3-\left|3-x\right|\)
b, B= \(\left|x-6\right|+\left|6-x\right|-2\)
c, C= \(\left|-x-1\right|+\left|-x-5\right|-x\)