25-22./x+3/=42
25-4./x+3/=16
4./x+3/=25-16
4./x+3/=9
/x+3/=9/4
x+3=9/4 hoặc x+3=-9/4
x+3=9/4 x+3=-9/4
x=9/4-3 x=-9/4-3
x=2.25-3 x=-2.25-3
x=-0.75 x=-5.25
Vậy x=-0.75; x=-5.25
Chứng minh rằng:
A = 1/3 + 1/32 + 1/33 + ..........+ 1/399 < 1/2
B = 3/12x 22 + 5/22 x 32 + 7/32 x 42 +............+ 19/92 x 102 < 1
C = 1/3 + 2/32 + 3/33 + 4/34 +.........+ 100/3100 ≤ 0
Tìm x, biết:
a) \(\left(-\dfrac{1}{3}\right)^3\) .x = \(\dfrac{1}{81}\)
b) 22 . 16 >2x > 42
c) 9.27 < 3x < 243
tìm x
2(x+56)(x-6)=3^25:3^22
\(\frac{x-25}{1979}-\frac{x-24}{1980}-\frac{x-23}{1981}-\frac{x-22}{1982}=\frac{x-1979}{25}-\frac{x-1980}{24}-\frac{x-1981}{23}-\frac{x-1982}{22}\)
giúp tôi với nếu đúng cho 3 tick
(x * 25% - 22/3) * 2 1/3= 1 5/8
Giúp mỉnh nhanh nha
(-25/27-31/42)-(-7/27-3/42)=???
\(\frac{x-3}{21}+\frac{x-3}{22}+\frac{x-3}{23}+\frac{x-3}{24}+\frac{x-3}{25}\)
\(Thanks\)
a)22+2x+3=144
b)(\(\sqrt{9}+\sqrt{4}\)).\(\sqrt{x}\)=10
c)(x+\(\dfrac{1}{2}\))2=\(\dfrac{4}{25}\)
Tìm x,y biết : x/3 = y/4 và:
1. 3y - 7x = 42
2. 2x + y =-16
3. 3x - y =-25
\(\frac{x-25}{1979}-\frac{x-24}{1980}-\frac{x-23}{1981}-\frac{x-22}{1982}=\frac{x-1979}{25}-\frac{x-1980}{24}-\frac{x-1981}{23}-\frac{x-1982}{22}\)
