a) Ta có :
\(\dfrac{1}{3}+\dfrac{2}{3}:x=-7\)
\(\dfrac{2}{3}:x=\left(-7\right)-\dfrac{1}{3}\)
\(\dfrac{2}{3}:x=\) \(-\dfrac{22}{3}\)
\(x=\dfrac{2}{3}:-\dfrac{22}{3}\)
\(x=-\dfrac{1}{11}\)
Vậy \(x=-\dfrac{1}{11}\) là giá trị cần tìm
a) Ta có :
\(\dfrac{1}{3}+\dfrac{2}{3}:x=-7\)
\(\dfrac{2}{3}:x=\left(-7\right)-\dfrac{1}{3}\)
\(\dfrac{2}{3}:x=\) \(-\dfrac{22}{3}\)
\(x=\dfrac{2}{3}:-\dfrac{22}{3}\)
\(x=-\dfrac{1}{11}\)
Vậy \(x=-\dfrac{1}{11}\) là giá trị cần tìm
tìm x , biết
a) 5/6 - x = -7 / 12 + 2/3
b) ( 2,4x - 36 ) : 1va5/7 = -1
c) 2 ( x - 1 ) - 3 ( 2x + 2 ) - 4 ( 2x + 3 ) = 16
d ) ( x - 2 ) . ( x + 3 ) > 0
Tìm x biết
a ) ( 2x - 1 ) . ( 5x + 2 ) = 0
b ) 3/7 + 3/7 : x = -1/2 - ( -3/4 )
c ) ( 3x + 5 ) . ( 2x - 3 ) < 0
1. Tìm x,y biết;
a) (2x-y6+7)^2012 + |x-3|^2013 bé hơn hoặc bằng 0
b) 2(x-1) - 3(2x+2) - 4(2x+3) = 16
c) (x-5)^x+1 - (x-5)^x+13 =0
d) |3x-4|\(\) bé hơn hoặc bằng 3
2. a) Tìm các số x,y,z biết x:y:z=3:4:5 và 2x^2 +2y^2 + 3z^ =-100
b) Cho a/b = b/c = c/a và a+b+c khác 0. Tính \(\frac{a^3b^2c^{1930}}{a^{1935}}\)
Bài 1:Tìm các số nguyên x
a) x . (5 - x) = 0 b) (3 - x) . (x2 + 1) = 0
c) (3 - x) . (x2 + 1) = 0 d) (2x - 1)3 = 8
e) (x + 3)2 = 16
Bài 2:Tính 1 cách hợp lý
a) -69 + 53 + 46 + (-94) + (-14) +78
b) 1 - 2 + 3 - 4 + 5 - 6 +.....+ 99 - 100
c) 1 + 3 - 5 - 7 + 9 + 11 -.....- 397 -399
Giúp mk vs!!Mk cần gấp
Tìm số nguyên x, biết:
a, x - 32 + 11 = 21 - 33 + 7
b, -2.(x+6) + 6. ( x-10)= 8
c, 7 . x .( 2 + x ) - 7 . x .( x+3) = 14
d, -4 . ( 2x+9) - (-8+3) -( x + 13 ) = 0
e, / 2x - 1 / = 15
Tìm x biết :
a) (x+1)(3-x) > 0
b) (2x-3)+4-x) <0
c) (x + 1/3 )(2/3 - 2x) = 0
tìm x biết :
a) \(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
b) \(\left(x.6\frac{2}{7}+\frac{3}{7}\right).2\frac{1}{5}-\frac{3}{7}=-2\)
c) \(x.3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
d) \(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
e) \(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
tìm x:
a)\(\left(x+\dfrac{1}{2}\right).\left(\dfrac{2}{3}-2x\right)=0\)
b) \(\left(x.6\dfrac{2}{7}+\dfrac{3}{7}\right).2\dfrac{1}{5}-\dfrac{3}{7}=-2\)
c) \(x.3\dfrac{1}{4}+\left(\dfrac{-7}{6}\right).x-1\dfrac{2}{3}=\dfrac{5}{12}\)
d) \(5\dfrac{8}{17}:x+\left(-\dfrac{4}{17}\right):x+3\dfrac{1}{7}:17\dfrac{1}{3}=\dfrac{4}{11}\)
Tìm x biết
a) x +(x + 1) + (x + 2) + .... + (x +30) = 620
b) 2+4+6+8+....+2x = 210
c) (x-1) +(x-2)+(x-3)+...+(x-20) = -610
d) (x-3)(2x-7) = 0
e) |3-x| = x-5
g) |5x-2| \(^{_{ }\le}\)13
h) x+|2-x|=6
t) \(3^x+3^{x+1}+3^{x+2}=1053\)
i) | x+1| +|x-2| = 3
Nhanh lên! Mình cần gấp. Nguyễn Huy Tú