\(y=\frac{85\frac{37}{30}-83\frac{5}{18}}{0,04}\): \(2\frac{2}{3}\). tính 1/20 của y

\(b=\frac{6\frac{3}{5}-3\frac{3}{14}\cdot5\frac{5}{6}}{\left(21-1,25\right):2,5}\). tính 125% của B

Một khu vườn HCN có S = 800 m² . Giảm chiều dài 25% . Tăng chiều rộng lên 25% của nó thì S tăng hay giảm ? m²

Thực hiện các phép tính

a) \(25\%-\frac{5}{4}+1\frac{5}{6}\)

b) \(75\%:2\frac{1}{5}-\left(0,5\right)^2.\left(-7\right)+2,5\left(7\frac{2}{3}-5\frac{2}{3}\right)\)

c) \(45:2\frac{4}{7}+50\%-1,25\)

d) \(350\%:\frac{105}{24}+4\frac{5}{6}:2-\left(0,5^2\right).30\%\)

e) \(4\frac{2}{5}.0,5-1\frac{3}{7}.14\%+\left(-0,8\right)\)

Bài 1 : Tính

1) \(\frac{4}{7}-\frac{1}{14}+\left|\frac{-5}{21}\right|\)

2) \(\left|\frac{-2}{3}\right|-\frac{1}{2}+3\)

3) \(\left|\frac{7}{-4}\right|-\frac{5}{8}+\frac{-2}{3}\)

4) \(\frac{4}{5}+\left|\frac{-3}{2}\right|+\frac{1}{-4}\)

5) \(\left|\frac{-1}{4}\right|-3+\frac{3}{4}\)

6) \(\left|\frac{-1}{3}\right|-\frac{5}{4}+\frac{1}{5}\)

Bài 2 : Tìm x, biết :

1) \(x-\left|1\frac{1}{6}\right|=\frac{5}{21}\)

2) \(x+\left|-1\frac{2}{3}\right|=\left|-\frac{3}{4}\right|\)

3) \(\left|x-\frac{1}{3}\right|=\frac{5}{2}\)

4) \(\left|x+\frac{2}{3}\right|=0\)

5) \(\left|x+2\right|=\frac{1}{3}-\frac{1}{5}\)

6) \(\left|x-4\right|=\frac{1}{5}-\left(\frac{1}{2}-\frac{5}{4}\right)\)

7) \(\left|x-\frac{5}{4}\right|=-\frac{1}{3}\)

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E cần gấp lắm ạ, cảm ơn.

Bài 1 : Tính

1) \(\frac{4}{7}-\frac{1}{14}+\left|\frac{-5}{21}\right|\)

2) \(\left|\frac{-2}{3}\right|-\frac{1}{2}+3\)

3) \(\left|\frac{7}{-4}\right|-\frac{5}{8}+\frac{-2}{3}\)

4) \(\frac{4}{5}+\left|\frac{-3}{2}\right|+\frac{1}{-4}\)

5) \(\left|\frac{-1}{4}\right|-3+\frac{3}{4}\)

6) \(\left|\frac{-1}{3}\right|-\frac{5}{4}+\frac{1}{5}\)

Bài 2 : Tìm x, biết :

1) \(x-\left|1\frac{1}{6}\right|=\frac{5}{21}\)

2) \(x+\left|-1\frac{2}{3}\right|=\left|-\frac{3}{4}\right|\)

3) \(\left|x-\frac{1}{3}\right|=\frac{5}{2}\)

4) \(\left|x+\frac{2}{3}\right|=0\)

5) \(\left|x+2\right|=\frac{1}{3}-\frac{1}{5}\)

6) \(\left|x-4\right|=\frac{1}{5}-\left(\frac{1}{2}-\frac{5}{4}\right)\)

7) \(\left|x-\frac{5}{4}\right|=-\frac{1}{3}\)

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E đang cần gấp, cảm ơn :)

Rút gọn:

a,\(\left(\frac{2}{3}\right)^3\):\(\left(\frac{-1}{3}\right)^5\)b,\(\left(\frac{5}{7}\right)^6\):\(\left(-\frac{25}{49^{ }}\right)^3\)

c,\(\left(-\frac{2}{9}\right)^4\).\(\left(\frac{27}{16}\right)^7\)d,\(\left(\frac{1}{3}\right)^6\).\(\left(-\frac{21}{19}\right)^3\)