a/ \(\frac{x+17}{x-12}=\frac{x-12+29}{x-12}=1+\frac{29}{x-12}\)
Để x+17 chia hết cho (x-12) thì (x-12) là ước của 29
Bạn tự liệt kê ra.
b/ ta có \(\frac{3x+6}{x-3}=\frac{3\left(x-3\right)+33}{x-3}=3+\frac{33}{x-3}\)
Đến đây giải tương tự như trên.
3.Tìm x biết:
a)2-x=17-(-5)
b)2x-6=-3-(-7)
c)(3x-6).3=\(3^4\)
4.Thực hiện phép tính:
90-(\(2^2\).25-\(3^2\).7)
b)248+(-12)+2012+(-236)
Tìm x ; y \(\in\) N :
a. \(\dfrac{4}{x}+\dfrac{y}{3}=\dfrac{5}{6}\)
b. 3x - xy -4y + 12 = 17
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
1. Tìm x , biết :
a, x-3 + (5+3) = 3-(6-4)
b, 3-(x-6)+(2x-4)=11
c, 17-(2-x)-(3-x-17)=6
2. Rút gọn phép tính :
a, a-(b-c)+(a-c+b)-b
b, 2x -(5-x+a)+(x-5-a)
Tìm x bieets:
a) x + 17 ⋮ (x - 12)
b) 3x + 6 ⋮ (x - 3)
P/s: giai day du va chi tiet minh se tick
Tìm số nguyên x:
1.x-43=(35-x)-48
2.305-x+14=48+(x-23)
3.-(x-6+85)=(x+51)-54
4.-(35-x)-(37-x)=33-x
5.13-|x|=|-4|
6.|x|-3+6=16
7.35-|2x-1|=14
8.|3x-2|+5=9-x
9.x-(-25+7)>12-(15-14)
10.|17+(x-15)|<5
tìm xϵz :
a)15 - ( x - 7 ) = -21
b) 3x + 17 = 2
c) 45 - ( x - 9 ) = -35
d)(-5) + x = 15
e) 2x - (-17) = 15
g) | x - 2 | = 3
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:
1) 280-(x-140):35=270 4) x17=x
2) 720:[41-(2x-5)]=23.5 5) 5x:52=125
3) (3x-4).(x-1)3=0 6)(x+2)5=210
