1 cách cực ngu
\(\frac{x+107}{7}+\frac{x+6}{47}+\frac{x+1}{33}+\frac{x+184}{21}=0\)
\(\Leftrightarrow1551\left(x+107\right)+231\left(x+6\right)+329\left(x+1\right)+517\left(x+184\right)=0\)
\(\Leftrightarrow1551x+165957+231x+1386+329x+517x+95128=0\)
\(\Leftrightarrow2628x+262800=0\)
\(\Leftrightarrow2628x=-262800\)
\(\Leftrightarrow x=-100\)
Giải pt
a)1/x-1-3x²/x³-1=2x/x²+x+1
b) 4x+5/x-1+2x-1/x+1=6
c) x+2/x-3+x-2/x+3=2(x²+6) /x²-9
d) 1/x-2+3=3x-2/x+2
e) 148-x/25+169-x/23+186-x/21+199-x/19=10
f) x+16/49+x+18/47=x+20/45-1
g) (x+2) (x+4) (x+6) (x+8) =-16
h) x³+3x²+3x+2=0
i) 4x/x²-5x+6+3x/x²-7x+6=0
1. tìm GTNN của A= x(x+2)(x+4)(x+6)+8
2. tìm GTLN của B=5+(1-x)(x+2)(x+3)(x+6)3
3.tìm GTNN của C=(x+3)4 + (x-7)4
4. Cho x>0. Tìm GTNN của P=\(\dfrac{4x^2+1}{2x}\)
tìm x biết
a) (6x-3) (2x+4) + (4x-1) (5-3x) = -21
b) 6x (3x+5) - 2x (9x-2) + (17-x) (x-1) + x (x-18) =0
c) (15-2x) (4x+1) - (13-4x) (2x-3) - (x-1) (x+2) + x2=52
d) (8x-3) (3x+2) - (4x+7) (x+4) = (2x+1) (5x-1) - 33
Giải các phương trình sau :
a. 3x - 2 (5 + 2x) = 45 - 2x
b. \(\frac{x-3}{5}=6-\frac{1-2x}{3}\)
c.\(\frac{5\left(x-1\right)+2}{6}-\frac{7x-1}{4}=\frac{2\left(2x+1\right)}{7}-5\)
d. (x - 1) (5x + 3) = (3x - 8) (x - 1)
e. (x - 1) (x2 + 5x - 2) - (x3 - 1) = 0
f.\(\frac{x-17}{33}+\frac{x-21}{29}+\frac{x}{25}=4\)
g. \(\frac{x+1}{65}+\frac{x+3}{63}=\frac{x+1}{61}+\frac{x+7}{59}\)
h.\(\frac{x+5}{2015}+\frac{x+4}{2014}+\frac{x+4}{1002}+\frac{x+6}{1003}=6\)
k.\(\frac{148-x}{25}+\frac{169-x}{23}+\frac{186-x}{21}+\frac{199-x}{19}=10\)
Giải các phương trình sau :
a. 3x - 2 (5 + 2x) = 45 - 2x
b. \(\frac{x-3}{5}=6-\frac{1-2x}{3}\)
c.\(\frac{5\left(x-1\right)+2}{6}-\frac{7x-1}{4}=\frac{2\left(2x+1\right)}{7}-5\)
d. (x - 1) (5x + 3) = (3x - 8) (x - 1)
e. (x - 1) (x2 + 5x - 2) - (x3 - 1) = 0
f.\(\frac{x-17}{33}+\frac{x-21}{29}+\frac{x}{25}=4\)
g. \(\frac{x+1}{65}+\frac{x+3}{63}=\frac{x+1}{61}+\frac{x+7}{59}\)
h.\(\frac{x+5}{2015}+\frac{x+4}{2014}+\frac{x+4}{1002}+\frac{x+6}{1003}=6\)
k.\(\frac{148-x}{25}+\frac{169-x}{23}+\frac{186-x}{21}+\frac{199-x}{19}=10\)
x-21/1999+x-33/1987<=x+6/2026+x+11/2031
Help me!!!
3(x-3)(x+7)+(x-4)2+47 tại x=0,5
SBT Toán 8 bài 33 câu b.
làm như thế này đứng chưa:
315-x/101+313-x/103+311-x/105+309-x/107=-4
<=>(315-x/101+1)+(313-x/103+1)+(311-x/105+1)+(309-x/107+1)=-4+4
<=>x+416/101+x+416/103+x+416/105+x+416/107=0
<=>(x+416)(1/101+1/103+1/105+1/107)=0
<=>x+416=0
=>x={-416}
1.giải phương trình :
1)1 + 2/x-1 + 1/x+3=x^2+2x-7/x^2+2x-3
2)x/x^2+5x+6=2/x^2+3x+2 (x=3)
3)1/x^2+9x+20 - 1/x^2+8x+12=x^2-2x-33/x^2+8x+15 (x=-5,7)
4)x+5/3x-6 - 1/2=2x-3/2x-4 (x=25/7)
5)x-1/x^3+1 + 2x+3/x^2-x+1=2x+4/x+1 - 2(x=0)
