4
\(A=\left(\frac{1}{\sqrt{25}+\frac{1}{5}+1}\right):\left(\frac{1}{25}-\frac{1}{\sqrt{25}-1}\right)..\)
\(B=\frac{1,5+0,\left(3\right)-0,1\left(6\right)}{2,5+1,\left(6\right)-0,8\left(3\right)}\)
\(C=1+7+7^2+.........+7^{50}\)
5
\(A=-\frac{1}{4}+\frac{7}{3}+\frac{3}{4}+\frac{9}{2}-\frac{5}{6}\)
\(B=\left(-0,75-\frac{1}{4}\right):\left(-5\right)+\frac{1}{15}-\left(-\frac{1}{5}:\left(-3\right)\right)\)
\(C=\frac{1}{1\cdot2\cdot3}+\frac{1}{2\cdot3\cdot4}+.....+\frac{1}{2015\cdot2016\cdot2017}\)
CÁC BN HÃY GIÚP EM 1 TÍ Ạ E KO NHỚ MẤY BÀI NÀY RA SAO Ạ
\(\)\(\sqrt{x+1}\)\(+2\sqrt{2x+2}\)\(-3\sqrt{4x+4}\)=3
giải hệ phương trình :
\(\left\{{}\begin{matrix}x^3+3xy+x+3y+2=0\\\sqrt{x-y+2}+1=9\left(x-y\right)^2+\sqrt{7x-7y}\end{matrix}\right.\)
Cho x,y>0 tm xy+x+y=1. Tính \(x\sqrt{\dfrac{2\left(1+y^2\right)}{1+x^2}}+y\sqrt{\dfrac{2\left(1+x^2\right)}{1+y^2}}+\sqrt{\dfrac{\left(1+x^2\right)\left(1+y^2\right)}{2}}\)
Bài 1. Giải các phương trình sau
1) \(\frac{3x+2}{2}-\frac{3x+1}{6}=\frac{5}{3}-2x\)
2) \(\frac{x-3}{5}=6-\frac{1-2x}{3}\)
3) \(2\left(x+\frac{3}{5}\right)=5-\left(\frac{13}{5}+x\right)\)
4) \(\frac{2x+3}{3}=\frac{5-4x}{2}\)
5) \(\frac{5x+3}{12}=\frac{1+2x}{9}\)
6) \(x-\frac{x+1}{3}=\frac{2x+1}{5}\)
7) \(\frac{3\left(x-3\right)}{4}+\frac{4x-10,5}{10}=\frac{3\left(x+1\right)}{5}+6\)
8) \(\frac{2\left(3x+1\right)+1}{4}-5=\frac{2 \left(3x-1\right)}{5}-\frac{3x+2}{10}\)
9) \(\frac{x+1}{3}+\frac{3\left(2x+1\right)}{4}=\frac{2x+3\left(x+1\right)}{6}+\frac{7+12x}{12}\)
10) \(\frac{2x-1}{3}-\frac{5x+2}{7}=x+13\)
Bài 1. Giải phương trình
a, 4x-10=0
b, 7-3x=9-x
c, 2x-(3-5x)=4(x+3)
d, 5-(6-x)=4(3-2x)
e, 4(x+3)=-7x+17
f, 5(x-3)-4=2(x-1)+7
h, 4(3x-2)-3(x-4)=7x+20
rút gọn:
A=(5*4^15*9^9-4*3^20*8^9)/(5*2^9*6^16-7*2^29*27^6)
B=8018/(2004*2006-2003*2005)
C=(x|x-2|)/(x^3-5x^2+6x)
giúp mình với nha. Mình đang cần gấP. ( dấu / là phân sống đó nha😉😉😉
1) (x+6)(3x-1)+x+6=0
2) (x+4)(5x+9)-x-4=0
3)(1-x)(5x+3)÷(3x-7)(x-1)
4)2x (2x-3)=(3-2x)(2-5x)
5)(2x-7)^2-6(2x-7)(x-3)=0
6)(x-2)(x+1)=x^2-4
7) x^2-5x+6=0
8)2x^3+6x^2=x^2+3x
9)(2x+5)^2=(x+2)^2
Tìm tập xác định của phân thức:
a) \(\frac{5x-10}{1-2x}\)
b) \(\frac{3x+5}{12x+3}\)
c) \(\frac{x^2-1}{x^2+2x+1}\)
d) \(\frac{9-4y^2}{36y^2-25}\)
e) \(\frac{2}{x+y}\)
f) \(\frac{x^2+y^2}{\left(x-1\right)\left(y+2\right)}\)