Chương I - Căn bậc hai. Căn bậc ba
Các câu hỏi tương tự
Cho bieu thuc A=\(\left(\dfrac{4}{x-\sqrt{x}}+\dfrac{\sqrt{x}}{\sqrt{x}-1}\right)\div\dfrac{1}{\sqrt{x}-1}\)
a/ Tim dieu kien cua x de bieu thuc A co gia tri xac dinh
b/ Rut gon A
c/ Tinh gia tri cua A khi x = \(4-2\sqrt{3}\)
d/ Tim gia tri nho nhat cua A
cho bieu thuc P= (\(\frac{3x+\sqrt{9x}-3}{x+\sqrt{x}-2}+\frac{1}{\sqrt{x}-1}+\frac{1}{\sqrt{x}-3}\) ): \(\frac{1}{x-1}\)
a) Tim dieu kien de P co nghia, rut gon bieu thuc P.
b) Tim cac so tu nhien x de \(\frac{1}{P}\)la so tu nhien
c) Tinh gia tri cua P voi x= 4-\(2\sqrt{3}\)
Giup mk vs mk dang can gap
Cho cac bieu thuc :
\(A=\dfrac{\sqrt{x}+4}{\sqrt{x}+2},B=\left(\dfrac{\sqrt{x}}{\sqrt{x}+4}+\dfrac{4}{\sqrt{x}-4}\right):\dfrac{x+16}{\sqrt{x}+2}\)
a) Rut gon B ?
b) Tim cac gia tri nguyen cua x de cac gia tri cua bieu thuc B(A-1) la so nguyen.
Voi gia tri nao cua x thi can thuc sau co nghia : \(\sqrt{\dfrac{-2}{x+1}}\)
moi nguoi giup minh cau nay voi , minh cam on!!
cho bieu thuc A=\(\left(\dfrac{6x+4}{3\sqrt{3x^3}-8}-\dfrac{\sqrt{3x}}{3x+2\sqrt{3x}+4}\right)\left(\dfrac{1+3\sqrt{3x^3}}{1+\sqrt{3x}}-\sqrt{3x}\right)\)
a.rut gon bieu thuc A
b. tim cac gia tri nguyen x de A nguyen
1,thu gon bieu thuc
a Adfrac{asqrt{a}-8+2a-4sqrt{a}}{a-4}
b,Bdfrac{12sqrt{6}}{sqrt{7+2sqrt{6}-sqrt{7-2sqrt{6}}}}
c, Cdfrac{sqrt{c^2+2c+1}}{left|cright|-1}
2,giai cac phuong trinh
a,x^2-9sqrt{x}+140
b, sqrt{3x^2-18x+28}+sqrt{4x^2-24x+45}-5-x^2+6
GIUP MINH VOI MINH CAN GAP
Đọc tiếp
1,thu gon bieu thuc
a A=\(\dfrac{a\sqrt{a}-8+2a-4\sqrt{a}}{a-4}\)
b,B=\(\dfrac{12\sqrt{6}}{\sqrt{7+2\sqrt{6}-\sqrt{7-2\sqrt{6}}}}\)
c, C=\(\dfrac{\sqrt{c^2+2c+1}}{\left|c\right|-1}\)
2,giai cac phuong trinh
a,\(x^2-9\sqrt{x}+14=0\)
b, \(\sqrt{3x^2-18x+28}+\sqrt{4x^2-24x+45}=-5-x^2+6\)
GIUP MINH VOI MINH CAN GAP
\(\sqrt{2X-1}=3\)
\(\sqrt{7X}-\sqrt{2X-3}\)
giup minh nhanh nha cac ban
Tim gia tri nho nhat cua bieu thuc B= \(x^2-2x+y^2-4x+7\)
Cho bieu thuc E= \(\left(\dfrac{2x\sqrt{x}+x-\sqrt{x}}{x\sqrt{x}-1}-\dfrac{x+\sqrt{x}}{x-1}\right).\dfrac{x-1}{2x+\sqrt{x}-1}+\dfrac{\sqrt{x}}{2\sqrt{x}-1}\)
a)Rut gon E
b)Tim GTNN cua E
c) Tìm x để E ≥ \(\dfrac{6}{7}\)
cho a b c la cac so thuc ko am thoa man a+b+c=3. tim GTLN cua K=\(\sqrt{12a+\left(b-c\right)^2}+\sqrt{12b+\left(a-c\right)^2}+\sqrt{12c+\left(a-b\right)^2}\)