\(=0,4\cdot0,5-\dfrac{1}{2}=0,2-0,5=-0,3\)
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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 (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(-2right)^3+dfrac{1}{2}:dfrac{1}{8}-sqrt{25}+left|-64right|
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}}{1dfrac{1}{6}-0,875+0,7}
6) left[2^3.left(-dfrac{1}{2}right)^3+dfrac{1}{2}right]+left[dfr...
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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) \(\left[2^3.\left(-\dfrac{1}{2}\right)^3+\dfrac{1}{2}\right]+\left[\dfrac{25}{22}+\dfrac{6}{25}-\dfrac{3}{22}+\dfrac{19}{25}+\dfrac{1}{2}\right]\)
Tính:left(dfrac{9}{25}-2.18right):left(3dfrac{4}{5}+0,2right) dfrac{3}{8}.19dfrac{1}{3}dfrac{3}{8}.33dfrac{1}{3} 15.left(-dfrac{2}{3}right)^2-dfrac{7}{3} dfrac{1}{2}sqrt{64}-sqrt{dfrac{4}{25}}+left(-1right)^{2007} left(-dfrac{5}{2}right)^2:left(-15right)-left(0,45+dfrac{3}{4}right).left(-1dfrac{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}
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Tính:
\(\left(\dfrac{9}{25}-2.18\right):\left(3\dfrac{4}{5}+0,2\right)\)
\(\dfrac{3}{8}.19\dfrac{1}{3}\dfrac{3}{8}.33\dfrac{1}{3}\)
\(15.\left(-\dfrac{2}{3}\right)^2-\dfrac{7}{3}\)
\(\dfrac{1}{2}\sqrt{64}-\sqrt{\dfrac{4}{25}}+\left(-1\right)^{2007}\)
\(\left(-\dfrac{5}{2}\right)^2:\left(-15\right)-\left(0,45+\dfrac{3}{4}\right).\left(-1\dfrac{5}{9}\right)\)
\(\left(\dfrac{-1}{3}\right)-\left(\dfrac{-3}{5}\right)^0+\left(1-\dfrac{1}{2}\right)^2:2\)
\(\left(\dfrac{1}{2}\right)^{15}.\left(\dfrac{1}{4}\right)^{20}\)
\(\dfrac{5^4.20}{25^5.4^5}\)
\(\dfrac{3}{5}+\dfrac{\left(-1\right)}{4},\dfrac{|-3|}{5}\cdot\dfrac{4}{9}+\dfrac{\left(-4\right)}{9},\sqrt{16}+\sqrt{25}\)
\(\frac{\sqrt{0,01}-\sqrt{0,25}}{\sqrt{3\frac{1}{16}}}\)
Giúp mik nha
a)3,6-left|x-0,4right|0
b)frac{x}{2}yfrac{z}{3} và x-2y+z210
c)left|x+0,25right|-4frac{1}{4}
d)x:left(0,25right)^4left(0,5right)^2
e)3^{x-1}+5.3^{x-1}162
f)frac{x}{-25}frac{2}{5}
g)left|x+frac{3}{4}right|-frac{3}{4}sqrt[]{frac{1}{9}}
Đọc tiếp
a)\(3,6-\left|x-0,4\right|=0\)
b)\(\frac{x}{2}=y=\frac{z}{3}\) và \(x-2y+z=210\)
c)\(\left|x+0,25\right|-4=\frac{1}{4}\)
d)\(x:\left(0,25\right)^4=\left(0,5\right)^2\)
e)\(3^{x-1}+5.3^{x-1}=162\)
f)\(\frac{x}{-25}=\frac{2}{5}\)
g)\(\left|x+\frac{3}{4}\right|-\frac{3}{4}=\sqrt[]{\frac{1}{9}}\)
Cho A= \(\dfrac{1}{\sqrt{x}+10}\); B=\(\dfrac{4}{2-\sqrt{x}}\)
10.\(\sqrt{0,01}\).\(\sqrt{\dfrac{16}{9}}\)+ 3\(\sqrt{49}\)-\(\dfrac{1}{6}\)\(\sqrt{4}\)
Bài 1:
a) \(\left(2-\sqrt{3}\right).\left(2+\sqrt{3}\right)+\sqrt{2}.\dfrac{\sqrt{2^5}}{1-\sqrt{9}}\)
b)\(\left(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+...+\dfrac{1}{49.50}\right).\dfrac{49}{50}\)
Cảm ơn trước nha