a)\(\left(\dfrac{3}{7}+\dfrac{1}{2}\right)^2=\left(\dfrac{13}{14}\right)^2=\dfrac{169}{196}\)
b)\(0,5.\sqrt{100}-\sqrt{81}=0,5.10-9=-4\)
Thực hiện phép tính:(hợp lý nếu có thể)
a, \(5.\dfrac{5}{27}+\dfrac{7}{23}+0,5.\dfrac{5}{7}+\dfrac{16}{23}+\dfrac{1}{2}\)
b, \(25\dfrac{1}{6}:\dfrac{-4}{5}-45\dfrac{1}{6}:\dfrac{-4}{5}\)
c, \(25.\left(\dfrac{-1}{5}\right)^3+\dfrac{1}{5}-2.\left(\dfrac{-1}{2}\right)^2-\dfrac{1}{2}\)
d, \(-\left(251.3+281\right)+3.251-\left(1-281\right)\)
e, \(\left(0,75-\dfrac{1}{4}\right):\left(-5\right)+\dfrac{1}{15}-\left(-\dfrac{1}{5}\right):\left(-3\right)\)
f, \(\sqrt{\dfrac{4}{81}}:\sqrt{\dfrac{25}{81}}-1\dfrac{2}{5}\)
a) [\(2^{-2}\) + 0,75] . \(3\dfrac{3}{5}\) - \(\sqrt{\dfrac{36}{25}}\) : \(\left(-1\dfrac{4}{5}\right)\) + 4 . \(\left(-\dfrac{1}{2015}\right)^0\)
b) \(\left(-\dfrac{3}{5}\right)^2\) . \(\left(0,6-\left|\dfrac{1}{2}-\dfrac{1}{5}\right|\right)\) - \(\sqrt{\left(\dfrac{-3}{8}\right)^2}\) : \(1\dfrac{1}{8}\)
c) \(\sqrt{0,49}\) : \(\sqrt{\dfrac{16}{25}}\) + \(\sqrt{\dfrac{4}{81}}\) : \(\sqrt{\dfrac{25}{81}}\) - \(\left(-\dfrac{1}{2}\right)^3\)
d) \(19\dfrac{1}{3}\) : \(\dfrac{7}{3}\) - \(33\dfrac{1}{3}\) : \(\dfrac{7}{3}\) - \(\left|-\dfrac{2}{7}\right|\)
e) \(\dfrac{4^6.9^5+6^9.120}{-6^{11}-8^4.3^{12}}\)
Các bạn giúp mình với
thực hiện phép tính (tính hợp lí nếu có thể)
1) \(-0,75.\dfrac{12}{-5}.4\dfrac{1}{6}.\left(-1\right)^2\)
2) \(\dfrac{11}{25}.\left(-24,8\right)-\dfrac{11}{25}.75,2\)
3) \(\left(-\dfrac{3}{4}+\dfrac{2}{7}\right):\dfrac{2}{3}+\left(-\dfrac{1}{4}+\dfrac{5}{7}\right):\dfrac{2}{3}\)
4) \(\left(\dfrac{1}{2}-\dfrac{2}{3}\right)-\left(\dfrac{5}{3}-\dfrac{3}{2}\right)+\left(\dfrac{7}{3}-\dfrac{5}{2}\right)\)
5) \(\left(-2\right)^2+\sqrt{36}-\sqrt{9}+\sqrt{25}\)
6) \(\left(-\dfrac{1}{3}\right)^2.\dfrac{4}{11}+\dfrac{7}{11}.\left(-\dfrac{1}{3}\right)^2\)
Thực hiện phép tính (bằng cách hợp lí nếu có thể)
a) \(1\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\)
b) \(\dfrac{3}{7}.19\dfrac{1}{3}-\dfrac{3}{7}.33\dfrac{1}{3}\)
c) \(9.\left(\dfrac{1}{3}\right)^3+\dfrac{1}{3}\)
d) \(15\dfrac{1}{4}:\left(-\dfrac{5}{7}\right)-25\dfrac{1}{4}:\left(-\dfrac{5}{7}\right)\)
Tính giá trị của các biểu thức sau :
a) \(\sqrt{0,01}-\sqrt{0,25}\)
b) \(0,5.\sqrt{100}-\sqrt{\dfrac{1}{4}}\)
Thực hiện phép tính
a, \(\dfrac{5}{16}\)+\(\dfrac{1}{12}-\dfrac{7}{8}\)
b,\(\dfrac{5}{17}+\dfrac{8}{9}+\dfrac{17}{17}-\)0,7\(-1\dfrac{8}{9}\)
c,\((1-\dfrac{1}{2})^2-(-\dfrac{1}{3})^2:\dfrac{1}{3}+\dfrac{\sqrt{64}}{4}\)
d,\(15\dfrac{1}{4}:(-\dfrac{5}{7})-25\dfrac{1}{4}:(-\dfrac{5}{7})\)
thực hiện phép tính (tính hợp lí nếu có thể)
1) \(\left(-\dfrac{1}{2}\right)^2:\dfrac{1}{4}-2.\left(\dfrac{-1}{2}\right)^3+\sqrt{4}\)
2) \(3-\left(\dfrac{-6}{7}\right)^0+\sqrt{9}:2\)
3) \(\left(-2\right)^3+\dfrac{1}{2}:\dfrac{1}{8}-\sqrt{25}+\left|-64\right|\)
4) \(\left(-\dfrac{1}{2}\right)^4+\left|-\dfrac{2}{3}\right|-2007^0\)
5) \(\dfrac{\left(0,4-\dfrac{2}{9}+\dfrac{2}{11}\right)}{1,4-\dfrac{7}{9}+\dfrac{7}{11}}-\dfrac{\dfrac{1}{3}-0,25+\dfrac{1}{5}}{1\dfrac{1}{6}-0,875+0,7}\)
6) \(\left[2^3.\left(-\dfrac{1}{2}\right)^3+\dfrac{1}{2}\right]+\left[\dfrac{25}{22}+\dfrac{6}{25}-\dfrac{3}{22}+\dfrac{19}{25}+\dfrac{1}{2}\right]\)
Bài 1:
a) Thực hiện phép tính: \(\dfrac{17}{13}\)-\(\dfrac{5}{3}\)
b) Cho tam giác ABC có góc A=70o và gócB=65o . Tính số đo của góc C.
Bài 2:
a) Tìm x biết: \(x+3\dfrac{1}{2}=\dfrac{11}{5}\)
b) Vẽ đồ thị của hàm số y = 3x
c) Tính nhanh: \(\left(\dfrac{-3}{7}+\dfrac{5}{11}\right):\dfrac{4}{31}+\left(\dfrac{-4}{7}+\dfrac{6}{11}\right):\dfrac{4}{31}\)
Tính:
\(\left(\dfrac{9}{25}-2.18\right):\left(3\dfrac{4}{5}+0,2\right)\)
\(\dfrac{3}{8}.19\dfrac{1}{3}\dfrac{3}{8}.33\dfrac{1}{3}\)
\(15.\left(-\dfrac{2}{3}\right)^2-\dfrac{7}{3}\)
\(\dfrac{1}{2}\sqrt{64}-\sqrt{\dfrac{4}{25}}+\left(-1\right)^{2007}\)
\(\left(-\dfrac{5}{2}\right)^2:\left(-15\right)-\left(0,45+\dfrac{3}{4}\right).\left(-1\dfrac{5}{9}\right)\)
\(\left(\dfrac{-1}{3}\right)-\left(\dfrac{-3}{5}\right)^0+\left(1-\dfrac{1}{2}\right)^2:2\)
\(\left(\dfrac{1}{2}\right)^{15}.\left(\dfrac{1}{4}\right)^{20}\)
\(\dfrac{5^4.20}{25^5.4^5}\)
