a, \(x+30\%x+1,5x=2,5\\ < =>x+0,3x+1,5x=2,5\\ < =>\left(1+0,3+1,5\right)x=2,5\\ < =>2,5x=2,5\\ =>x=\dfrac{2,5}{2,5}=1\)
b, \(2\left(3x-4\right)-3\left(x+2\right)=3\\ < =>6x-8-3x-6=3\\ < =>6x-3x=3+8+6\\ < =>3x=17\\ =>x=\dfrac{17}{3}\)
c, \(-110+7x-80=25+2x-80\\ < =>-110-80+80-25=2x-7x\\ < =>-135=-5x\\ =>x=\dfrac{-135}{-5}=27\)
tìm x , biết
1) x : 2 1/3 = -1,5 4) x - 15% = 1/3
2) 2,5 . x = 11/15 5) ( 3/7x + 1 ) : ( -4 1/7 )
3) 30%x = -1,2 6) x - 35%x = 1/25
chú ý : / là phần nha
tìm x , y , z biết
a) / x - 1/2 / - 2x = 1
b ) / x - 1/3 / + / 2y - 1 / = 0
c ) / x - 1,5 / + / y - 2,5 / + / x + y + z / < hoặc = 0
tìm x , y , z biết
a) / x - 1/2 / - 2x = 1
b ) / x - 1/3 / + / 2y - 1 / = 0
c ) / x - 1,5 / + / y - 2,5 / + / x + y + z / < hoặc = 0
Bai 1 : Tinh a) 24 - (-15) - 2 b) (-85) + 10 - (-85) - 50 c) 71 - (-30) - (+18) + (-30)
d) -(30) - (+37) + (+37) + (-85) e) (35-815) - (795-65) g) (2002-79+15) + (-79+15)
h) -(515-80+91) - (2003+80-91)
Bai 2: Tim x,biet a) 25 - (30+x) = x - (27-8) b) (x-12) - 15 = (20-17) - (18+x) c) 15 - x = 7 - (-2) d) x - 35 = (-12) - 3 e) I5-xI - 26 = - 15
Bài 2: Tìm x biết:
a) \(|3x-5|+3x=5\)
b)\(|5x-4|=|x+2|\)
c) 7,5 -3 \(|5-2x|=-4,5\)
d) \(|x-1,5|+|2,5-x|=0\)
e) \(|x.\left(x^2-\dfrac{9}{4}\right)|=x\)
f) 2x -\(|2x-1|=1\)
n) \(|2x-5|+|3x+7|=8\)
GIÚP MÌNH NHÉ GẤP LẮM ĐÓ!
Tìm x,y Biết :
a, | 2x | - | - 2,5 | = | -7,5|
b, | 3x | . | -3,5 | = | -2,8 |
c, ( 3x - 5 ) . ( \(\frac{3}{2}\)x + 2 ) . ( 0,5x - 10 ) = 0
tìm x
a)-5.(-x+7)-3.(-x-5)=-4.(12-x)+48
b) (-x-7)-5.(-x-3)=12.(3-x)
c)-2.(15-3x)-4.(7x+8)=-5-9.(-2x+1)
d) (-3x-7) - 4.(-2x-11)=7.(4x+10)+9
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
Tìm các số nguyên x, biết:
a, -2.(x + 6) +6.(x-10) = 8
b, -3x +5 = 41
c, |2x - 5| = 13
d, |7x + 3| = 66
e, |7x + 1| = 20
