B = \(\sqrt{9}\) + \(\sqrt{\dfrac{4}{9}}\)
B = 3 + \(\dfrac{2}{3}\)
B = \(\dfrac{9}{3}\) + \(\dfrac{2}{3}\)
B = \(\sqrt{9}\) + \(\sqrt{\dfrac{4}{9}}\)
B = 3 + \(\dfrac{2}{3}\)
B = \(\dfrac{9}{3}\) + \(\dfrac{2}{3}\)
a) Tìm GTNN của các biểu thức sau :
*A=\(\sqrt{x}\) -4 +\(\dfrac{5}{7}\)
*B=\(\sqrt{\dfrac{2}{7}x-\dfrac{3}{5}+\dfrac{4}{9}}\)
b)Tìm GTLN của các biểu thức sau:
A=-\(\sqrt{x+\dfrac{5}{41}+\dfrac{7}{12}}\)
B=-\(\dfrac{5}{13}-\sqrt{x-\dfrac{2}{3}}\)
Câu 1:Tìm x,y,z
a)x*y=\(\dfrac{2}{7}\); y*z= \(\dfrac{3}{2}\);z*x=\(\dfrac{3}{7}\)
b)x*y=9*z;y*z=4*x;z*x=1*by
Câu 2:Tìm x
a)\(\sqrt{x}=5\)
b)2*\(\sqrt{x}=\sqrt{12}\)
c)x2=6
d)-3\(\sqrt{x}=-\sqrt{18}\)
e)x2-1=7
f)3\(\sqrt{x^2}=\sqrt{9}\)
Các bạn giúp mình với.Hiuhiu
Yêu các bạn nhìu.💕💞💓💕💞💓
so sánh các số sau: a,\(0,5\sqrt{100}-\sqrt{\frac{4}{25}}và\left(\sqrt{1\frac{1}{9}-\sqrt{\frac{9}{16}}}\right):5\)
2) -12 : (\(\dfrac{3}{4}\) - \(\dfrac{5}{6}\))2
s) \(\dfrac{-1}{12}\) - (\(2\dfrac{5}{8}\) - \(\dfrac{1}{3}\))
t) -1,75 - (\(\dfrac{-1}{9}\) - \(2\dfrac{1}{18}\))
c) (\(\sqrt{\dfrac{1}{9}}\) - 0,5)3 + \(\dfrac{-1}{3}\)
d) (\(\dfrac{1}{2}\) - \(\sqrt{\dfrac{4}{25}}\))2 - \(2\dfrac{1}{2}\)
a) \(\frac{8^{15}.3^{16}}{4^{23}.9^8}\)
b) \(\sqrt{121}-4.\sqrt{9}+\sqrt{36}\)
c) \(\frac{2^2}{5^2}+5\frac{1}{2}.\left(4,5-2,5\right)+\frac{2^3}{-4}+\left(-2016\right)^0\)
1) Tính:
a) \(\frac{-5}{9}\): \(\frac{-7}{18}\) +\(1\frac{2}{7}\)
b) \(\frac{2^{27}.9^4}{6^9.8^5}\)
c)\(\sqrt{13^2}-5^2\) +\(\sqrt{3^2+4^2}\) -\(\sqrt{\left(-7\right)^2}\)
A=\(\dfrac{\sqrt{a+4\sqrt{a-4}}+\sqrt{a-4\sqrt{a-4}}}{\sqrt{1-\dfrac{8}{a}+\dfrac{16}{a^2}}}\)
Rút gọn A với a>8
thực hiện phép tính
a. \(\dfrac{11}{21}+\dfrac{-2}{7}+\dfrac{10}{21}+\left(-1\dfrac{1}{5}\right)+\dfrac{-5}{7}\)
\(b.\left(0.25\right)^5.\left(-5\dfrac{5}{9}\right).\left(-4\right)^5\)
\(c.\dfrac{3}{22}.19\dfrac{1}{7}+\dfrac{3}{22}.2\dfrac{6}{7}-\sqrt{36}\)
Tại sao \(\sqrt{16+9}\ne\sqrt{16}+\sqrt{9}\)