\(đk:x\ne1\)
\(\dfrac{x^2+5}{3x^2-6x+3}.\dfrac{7x+35}{6x-6}\\ =\dfrac{x^2+5}{3\left(x^2-2x+1\right)}.\dfrac{7\left(x+5\right)}{6\left(x-1\right)}\\ =\dfrac{x^2+5}{3\left(x-1\right)^2}.\dfrac{7\left(x+5\right)}{6\left(x-1\right)}\\ =\dfrac{7\left(x^2+5\right)\left(x+5\right)}{18.\left(x-1\right)^3}\)
\(\dfrac{x^2+5x}{3x^2-6x+3}\):\(\dfrac{7x+35}{6x-6}\)
Giải phương trình:
a) \(\dfrac{3x-2}{x^2-12x+20}-\dfrac{4x+3}{x^2+6x-16}=\dfrac{7x+11}{x^2-2x-80}\)
b) \(\dfrac{2x-5}{x^2+5x-36}-\dfrac{x-6}{x^2+3x-28}=\dfrac{x+8}{x^2+16x+63}\)
Gi ải các phương trình sau
a)x-3(2x-6)=21-(5x+3)
b)(x-2)(x+2)-(x-1)2=2(x+1)
c)\(\dfrac{9x+4}{6}\)=1-\(\dfrac{3x-5}{9}\)
d)\(\dfrac{6x+1}{x^2-7x+10}\)+\(\dfrac{5}{x-2}\)=\(\dfrac{3}{x-5}\)
Giải các phương trình sau:
\(e.\dfrac{12}{1-9x^2}=\dfrac{1-3x}{1+3x}-\dfrac{1+3x}{1-3x}\)
\(f.\dfrac{6x+1}{x^2-7x+10}+\dfrac{5}{x-2}=\dfrac{3}{x-5}\)
\(g.\dfrac{2}{x+2}-\dfrac{2x^2+16}{x^3+8}=\dfrac{5}{x^2-2x+4}\)
\(h.\dfrac{8}{x-8}+\dfrac{11}{x-11}=\dfrac{9}{x-9}+\dfrac{10}{x-10}\)
giải các phương trình sau:
a.2x + 3 = 7x - 7
b. \(\dfrac{x}{x+2}+\dfrac{x-1}{x-2}=\dfrac{2x^2+x}{x^2-4}\)
c.|x-1|=1
d.6x - 2 = 2x + 10
e. \(\dfrac{x}{2}+\dfrac{x+1}{3}=\dfrac{5}{2}\)
f.|x-1|=x+2
g.9x - 6 = 3x+12
h.x(x-1)+3(x-1)=0
i.\(\dfrac{7}{x}+\dfrac{2}{x+1}=\dfrac{x+23}{x\left(x+1\right)}\)
j.8x - 3=6x +9
k. |x-1|-4=5
l.\(\dfrac{x-5}{x^2-16}+\dfrac{3}{x+4}=\dfrac{7}{x-4}\)
Giai bptr sau
\(\dfrac{6x+5}{4}-\dfrac{x-3}{2}< \dfrac{6x-1}{3}+\dfrac{7x-1}{12}\)
Quy đồng mẫu các phân thức sau:
a)\(\dfrac{7x-1}{2x^2+6x};\dfrac{5-3x}{x^2-9}\)
tính
\(\dfrac{x^2+38x+4}{2x^2+17x+1}-\dfrac{3x^2-4x-2}{2x^2+17x+1}\)
\(\dfrac{3x+1}{3x^2-3x+1}+\dfrac{x^2-6x}{x^2-3x+1}\)
\(\dfrac{-x}{3x-2}+\dfrac{7x-4}{3x-2}\)
Tìm GTNN của các biểu thức sau
A=\(\dfrac{2}{6x-5-9x^2}\)
B=\(\dfrac{4x^2-6x+3}{2x^2-3x+2}\)
C=\(\dfrac{3x^2-8x+6}{x^2-2x+1}\)
GIÚP MÌNH 3 CÂU NÀY VỚI MÌNH CẢM ƠN!!!
