Bài 4: Giá trị tuyệt đối của một số hữu tỉ. Cộng, trừ, nhân, chia số thập phân
Các câu hỏi tương tự
Tính hợp lí
a)\(\dfrac{2-\dfrac{1}{3}+\dfrac{1}{4}}{2+\dfrac{1}{6}-\dfrac{1}{4}}+\dfrac{\dfrac{3}{5}-\dfrac{1}{4}+\dfrac{5}{10}}{\dfrac{1}{2}+\dfrac{3}{4}-\dfrac{2}{5}}\)
b)\(\dfrac{\dfrac{5}{79}+\dfrac{5}{83}+\dfrac{1}{17}}{\dfrac{17}{79}+\dfrac{17}{83}+\dfrac{1}{5}}\)
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
\(2.x-\dfrac{5}{4}=\dfrac{20}{15}\)
\(\left(x+\dfrac{1}{3}\right)^3=\left(\dfrac{-1}{8}\right)\)
1, \(\dfrac{x}{3}=\dfrac{y}{2}\); \(\dfrac{x}{5}=\dfrac{x}{7}\) và x +2y = -112
2, 2x = 3y; 5y = 7z và 3x - 7y + 5z = 30
3, \(\dfrac{x}{y}=\dfrac{10}{9};\) \(\dfrac{y}{z}=\dfrac{3}{4}\) và x +2y - 3z = -48
Làm giúp, cần gấp
Tính giá trị của biểu thức:
\(\dfrac{\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{3}{7}+\dfrac{3}{11}}{\dfrac{13}{4}-\dfrac{13}{5}+\dfrac{13}{7}+\dfrac{13}{11}}\)
Hnay nộp rồi, nhanh nha
18 tháng 10 2017 lúc 18:54
giúp mk vs làm mãi ko ra mk cảm ơn trc.
a)\(P=\dfrac{\dfrac{42}{31}.\dfrac{31}{7}-\left(1.5-6\dfrac{1}{3}.\dfrac{2}{19}\right)}{4\dfrac{5}{6}+\dfrac{1}{6}.\left(12-5\dfrac{1}{3}\right)}.\left(-1:\dfrac{14}{39}\right)\)
b)\(Q=\left(\dfrac{1}{4}-1\right).\left(\dfrac{1}{9}-1\right).\left(\dfrac{1}{16}-1\right).\left(\dfrac{1}{25}-1\right).....\left(\dfrac{1}{121}-1\right)\)
8 tháng 12 2023 lúc 19:41
\(\left|x-\dfrac{1}{2}\right|+\dfrac{3}{4}=\dfrac{9}{10}\)
Tìm x, biết:
a) dfrac{x+1}{5} + dfrac{x+3}{4} dfrac{x+5}{3} + dfrac{x+7}{2}
b) dfrac{3}{left(x+2right)left(x+5right)} + dfrac{5}{left(x+5right)left(x+10right)} + dfrac{7}{left(x+10right)left(x+17right)} dfrac{x}{left(x+2right)left(x+17right)}
Giải chi tiết cho mk cả hai phần nha!
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Tìm x, biết:
a) \(\dfrac{x+1}{5}\) + \(\dfrac{x+3}{4}\) = \(\dfrac{x+5}{3}\) + \(\dfrac{x+7}{2}\)
b) \(\dfrac{3}{\left(x+2\right)\left(x+5\right)}\) + \(\dfrac{5}{\left(x+5\right)\left(x+10\right)}\) + \(\dfrac{7}{\left(x+10\right)\left(x+17\right)}\) = \(\dfrac{x}{\left(x+2\right)\left(x+17\right)}\)
Giải chi tiết cho mk cả hai phần nha!
Tìm x , biết :
1, |dfrac{3}{2}x + dfrac{1}{2}| | 4x - 1 |
2, | dfrac{5}{4}x - dfrac{7}{2} | - | dfrac{5}{8}x+dfrac{3}{5} | 0
3, | dfrac{7}{5}x+dfrac{2}{3} | | dfrac{4}{3}x-dfrac{1}{4} |
4, | dfrac{7}{8}x+dfrac{5}{6} | - | dfrac{1}{2}x+5 | 0
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Tìm x , biết :
1, |\(\dfrac{3}{2}\)x + \(\dfrac{1}{2}\)| = | 4x - 1 |
2, | \(\dfrac{5}{4}\)x - \(\dfrac{7}{2}\) | - | \(\dfrac{5}{8}x+\dfrac{3}{5}\) | = 0
3, | \(\dfrac{7}{5}x+\dfrac{2}{3}\) | = | \(\dfrac{4}{3}x-\dfrac{1}{4}\) |
4, | \(\dfrac{7}{8}x+\dfrac{5}{6}\) | - | \(\dfrac{1}{2}x+5\) | = 0
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) \(\left(\dfrac{2}{11.13}+\dfrac{2}{13.15}+...+\dfrac{2}{19.21}\right)-x+4\dfrac{221}{231}=2\dfrac{1}{3}\)