`7/2 : 2/5 = x : 8/7`
`35/4 = x xx 7/8`
`x = 35/4 : 7/8`
`x = 10`.
\(\dfrac{\text{7}}{2}:\dfrac{4}{10}=x:\dfrac{8}{7}\)
\(\text{x}.\dfrac{7}{8}=\dfrac{7}{2}x\dfrac{5}{2}=\dfrac{35}{4}\)
\(x=10\)
a,0,4.\(\sqrt{0,25-\sqrt{\dfrac{1}{4}}}\)
b,3/2+2(x-1)=-5\(\dfrac{1}{2}\)
c.7/4|x+4/5|+1/3=8/3
Tìm x, biết:
a) \(\dfrac{3}{7}\)x - 0,4 = \(\dfrac{-17}{35}\)
b) 0,2. (x - 3) + 2,4= 10
c) (x : 2,2) . \(\dfrac{1}{6}\) = \(\dfrac{-3}{8}\) . (0,5 - \(1\dfrac{3}{5}\))
Tính M=\(\left(\dfrac{0,4-\dfrac{2}{9}+\dfrac{2}{11}}{1,4-\dfrac{7}{9}+\dfrac{7}{11}}-\dfrac{\dfrac{1}{3}-0,25+\dfrac{1}{5}}{1\dfrac{1}{6}-0,875+0,7}\right):\dfrac{2021}{2022}\)
a)\(0,5+\dfrac{1}{3}+0,4+\dfrac{5}{7}-\dfrac{1}{6}-\dfrac{4}{35}\)
b)\(\left(3-\dfrac{1}{4}+\dfrac{2}{3}\right)-\left(5+\dfrac{1}{3}-\dfrac{6}{5}\right)-\left(-6-\dfrac{7}{4}+\dfrac{3}{2}\right)\)
c)\(\dfrac{1}{3}-\dfrac{3}{4}-\left(-\dfrac{3}{5}\right)+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}\)
Tính bằng cách hợp lí giá trị của biểu thức.
A = \(\left(3-\dfrac{1}{4} +\dfrac{3}{2}\right)\)- \(\left(5+\dfrac{1}{3}-\dfrac{5}{6}\right)\)-\(\left(6-\dfrac{7}{4}+\dfrac{3}{2}\right)\)
B =\(0,5+\dfrac{1}{3}+0,4+\dfrac{5}{7}+\dfrac{1}{6}-\dfrac{4}{35}+\dfrac{1}{41}\)
B = \(1,6^2\) . \(0,4^2\) - 14\(\dfrac{1}{4}\) + I - \(\dfrac{7}{5}\) I - 1\(\dfrac{3}{4}\)
Tính giá trị của các biểu thức sau :
a)\(\left(7+3\dfrac{1}{4}-\dfrac{3}{5}\right)\)+(0,4 - 5) - \(\left(4\dfrac{1}{4}-1\right)\)
b)\(\dfrac{2}{3}\) - \(\left[\left(-\dfrac{7}{4}\right)-\left(\dfrac{1}{2}+\dfrac{3}{8}\right)\right]\)
c)\(\left(9-\dfrac{1}{2}-\dfrac{3}{4}\right)\):\(\left(7-\dfrac{1}{4}-\dfrac{5}{8}\right)\)
d)3 - \(\dfrac{1-\dfrac{1}{7}}{1+\dfrac{1}{7}}\)
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Câu 13. (0,5 điểm): Tính giá trị $\left(2+\dfrac{1}{3}-0,4\right)-\left(7-\dfrac{3}{5}-\dfrac{4}{3}\right)-\left(\dfrac{1}{5}+\dfrac{5}{3}-4\right)$.
Tính:
a) (-0,4)2 - (-0,4)3 . (-3)
b) \(\left(1\dfrac{3}{4}\right)^3\) - \(\left(1\dfrac{3}{4}\right)^2\) + (-1,031)0
c) \(\left(\dfrac{2}{3}\right)^3\) - 4. \(\left(-1\dfrac{3}{4}\right)^2\) + \(\left(-\dfrac{2}{3}\right)^3\)
Tính:
a) (-0,4)2 - (0,4)3 . (-3)
b) \(\left(1\dfrac{3}{4}\right)^3\) - \(\left(1\dfrac{3}{4}\right)^2\) + (-1,031)0
c) \(\left(\dfrac{2}{3}\right)^3\) - 4. \(\left(-1\dfrac{3}{4}\right)^2\) + \(\left(-\dfrac{2}{3}\right)^3\)
