a,\(\left(\frac{2^2}{5}\right)\)+\(5\frac{1}{2}\).(4,5-2,5)+\(\frac{2^3}{-4}\)
b,\(\left(-2^3\right)\)+\(\frac{1}{2}\):\(\frac{1}{8}\)-\(\sqrt{25}\)+|-64|
c,\(\frac{\sqrt{3^2+\sqrt{39}^2}}{\sqrt{91^2}-\sqrt{\left(-7^2\right)}}\)
d,\(\left(-2^2\right)+\sqrt{36}-\sqrt{9}+\sqrt{25}20.20\))
e,\(\sqrt{25}-3\sqrt{\frac{4}{9}}\)
h,\(\left(-3^2\right)\).\(\frac{1}{3}\)-\(\sqrt{49}\)+\(\left(5^3\right)\):\(\sqrt{25}\)
Chứng minh rằng: \(\frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+....+\frac{1}{\sqrt{100}}>12\)
Thực hiện phép tính
a,\(\frac{3}{5}:\left(\frac{-1}{15}-\frac{1}{6}\right)+\frac{3}{5}:\left(\frac{-1}{3}-1\frac{1}{15}\right)\)
b,\(10.\sqrt{0,01}.\sqrt{\frac{16}{9}}+3\sqrt{49}-\frac{1}{6}\sqrt{4}\)
Giúp mk a~
tính: \(\frac{\sqrt{3^2}-\sqrt{39^2}}{\sqrt{7^2}-\sqrt{91^2}}\)
\(\frac{\sqrt{0,01}-\sqrt{0,25}}{\sqrt{3\frac{1}{16}}}\)
Giúp mik nha
Bai 1:Tinh: \(\sqrt{1}\) - \(\sqrt{4}\) + \(\sqrt{9}\) - \(\sqrt{16}\) + \(\sqrt{25}\)- \(\sqrt{36}\)+........- \(\sqrt{400}\)
Bai 2: Thuc hien phep tinh (bang cach hop li neu co the)
a, 15/34+7/21+19/24-1\(\dfrac{15}{17}\)+2/3 c, 1/2+3/2*5/6
b,\(\sqrt{25}\)+3^2-\(\sqrt{9}\)
Bai 3 : mot lop hoc co 35 hs sau khi khao sat so hs duoc xep thanh ba loai gioi,kha ,
trung binh.So hs gioi va kha ti le voi 2 va 3 ; so hs kha va trung binh la luot ti le voi 4 va 5 .Tinh
so hs moi loai?
Bai 4 : thuc hien phep tinh sau do lam tron den chu so thap hpan thu nhat
a, -5,18-0,479 c, ( | -2,45| + 3,1)*1/2 - 3/4
b, (3-1/2)^2 + (1-5/2)^2
B1.So sánh A và B biết:
A=\(\sqrt{225}\)-\(\frac{1}{\sqrt{5}}\)-1
B=\(\sqrt{196}\)-\(\frac{1}{\sqrt{6}}\)
b1.Cho N=\(\frac{9}{\sqrt{x-5}}\)
tìm x∈Zđể N có giá trị nguyên.
Giups mk với các bn ơi mai mk pk nộp rùi
Bài 1: Thực hiện phép tính:
a) \(\left(\frac{3}{5}\right)^2-[\frac{1}{3}:3-\sqrt{16}.\left(\frac{1}{2}\right)^2]-\left(10\times12-2014\right)^0\)
b)\(|-\frac{100}{123}|:\left(\frac{3}{4}+\frac{7}{12}\right)+\frac{23}{123}:\left(\frac{9}{5}-\frac{7}{15}\right)\)
c) \(\frac{\left(-5\right)^{32}\times20^{43}}{\left(-8\right)^{29}\times125^{25}}\)
Bài 2: Tìm x biết
a)\(\frac{2}{3}-\left(\frac{3}{4}-x\right)=\sqrt{\frac{1}{9}}\)
b) \(\left(\frac{1}{2}-x\right)^2=\left(-2\right)^2\)
c) \(|3x+\frac{1}{2}|-\frac{2}{3}=1\)
d) \(3^{2x+1}=81\)
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