giải phương trình:
\(\dfrac{x-5}{1990}+\dfrac{x-15}{1980}+\dfrac{x-25}{1970}=\dfrac{x-1990}{5}+\dfrac{x-1980}{15}+\dfrac{x-1970}{25}\)
Giải pt: x2+5x+21/x2+8x+12 =x+17/4x+8 .Ai trả lời đúng mình tick!Tks trước.
(x-2)2/12-(x+1)2/21=(x-4)(x-6)/28
giải các phương trình sau
a) \(3\left(x+1\right)\left(x-1\right)+5=\left(x-1\right)\left(3x+2\right)\)
b) \(\dfrac{x+4}{5}-x+4=\dfrac{x}{3}-\dfrac{x-2}{2}\)
c) \(\dfrac{29-x}{21}+\dfrac{27-x}{23}+\dfrac{25-x}{25}+\dfrac{23-x}{27}+\dfrac{21-x}{29}=-5\)
Giải các phương tình:
a) ((x+1)/65) + ((x+2)/64) = ((x+3)/63) + ((x+4)/62)
b) ((x-12)/77) + ((x-11)/78) = ((x-74)/15) + ((x-72)/17)
5,\(\dfrac{x^2-5x-4}{8}\)=\(\dfrac{x+1}{2}\)+\(\dfrac{x^2-10x}{9}\)
6,(x+3)(x-3)=(x-1)(9-x)
7,(x-1)\(^2\)=9(x^2+2x+1)
8,(x^2-5x+8)\(^2\)-(5x-17)\(^2\)
giup em voi a
1) giải pt :
a) \(\dfrac{x-5}{100}+\dfrac{x-4}{101}+\dfrac{x-3}{102}=\dfrac{x-100}{5}+\dfrac{x-101}{4}+\dfrac{x-102}{3}\)
b) \(\dfrac{29-x}{21}+\dfrac{27-x}{23}+\dfrac{25-x}{25}+\dfrac{23-x}{27}+\dfrac{21-x}{29}=-5\)
2) giải pt :
a) \(\left(5x+1\right)^2=\left(3x-2\right)^2\)
b) \(\left(x+2\right)^3=\left(2x+1\right)^3\)
c) \(\left(x+3\right)^4+\left(x+5\right)^4=2\)
d) \(x^4-3x^3+4x^2-3x+1=0\)
1) giải phương trình:
a) (x-1)^3+(2-x)(4+2x+x^2)+3x(x+2)=17
b) x(x-5)(x+5)-(x+2)(x^2-2x+4)=3
giải nhanh giúp mik, mik đag cần gấp
mơn trước