Tìm số nguyên x, biết :
a) 13-(x-7)=5 b) 7-x=11-(-7)
b, 23.(x-7)=3.25
=>23.(x-7)=96
=>8.(x-7)=96
=>x-7=96:8
=>x-7=12
=>x=12+7
=>x=19
c,33+3.|x-1| =72-20190
=>33+3.|x-1| =48
=>3.|x-1| =48-33
=>3.|x-1| =15
=>|x-1| =15:3
=>|x-1| =5
=>x-1= ± 5
=>x-1=5 =>x=5-1 =>x=4
x-1= -5 =>x=-5-1 =>x=-6
Tìm số nguyên x biết
a,|x+5|=x+5
b,|x-7|=7-x
c,|13-(x-5)|=8
d,19-|x+2|=7
Tìm số nguyên x, biết: a) (-15).x = 10.(- 4) - 5; b) (- 3).x - 4 = 2. (- 7) + 4 c) 7.x + l = -13; a) (- 8).x + 17 = - 23;
bài 3 :tìm các số nguyên x , y biết :
a) x/3 = 7/y
b ) x/y = -13/11
c ) x/y-1 = 5/-19
a, x=7 y=3
b, x=-13 y=11
c, x=5 y=-18
h tôi đi
\(a,\frac{x}{4}=\frac{7}{x}\)
\(\Rightarrow x\cdot y=7\cdot4=\)
Bài 1: Tìm x nguyên, biết:
a) x + 5 = 20 - (12 -7)
b)15 - (3+ 2x) = 22
c) -11 - (19 - x) = 50
d)159 - (25 - x) = 43
e) (79 - x) - 43 = - (17 - 52)
f) (7 + x) - (21 - 13) = 32
g) - x + 20 = (-15) + 8 + 13
h) - (-x + 13 -142) + 18 = 55
Xin cảm ơn!
a) \(x+5=20-\left(12-7\right)\)
\(\Rightarrow x+5=20-5\)
\(\Rightarrow x+5=15\)
\(\Rightarrow x=15-5\)
\(\Rightarrow x=10\)
b) \(15-\left(3+2x\right)=2^2\)
\(\Rightarrow3+2x=15-4\)
\(\Rightarrow3+2x=11\)
\(\Rightarrow2x=11-3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=\dfrac{8}{2}\)
\(\Rightarrow x=4\)
c) \(-11-\left(19-x\right)=50\)
\(\Rightarrow19-x=-11-50\)
\(\Rightarrow19-x=-61\)
\(\Rightarrow x=61+19\)
\(\Rightarrow x=80\)
d) \(159-\left(25-x\right)=43\)
\(\Rightarrow25-x=159-43\)
\(\Rightarrow25-x=116\)
\(\Rightarrow x=25-116\)
\(\Rightarrow x=-91\)
e) \(\left(79-x\right)-43=-\left(17-52\right)\)
\(\Rightarrow\left(79-x\right)-43=52-17\)
\(\Rightarrow79-x-43=35\)
\(\Rightarrow36-x=35\)
\(\Rightarrow x=1\)
f) \(\left(7+x\right)-\left(21-13\right)=32\)
\(\Rightarrow7+x-8=32\)
\(\Rightarrow x-1=32\)
\(\Rightarrow x=32+1\)
\(\Rightarrow x=33\)
g) \(-x+20=-15+8+13\)
\(\Rightarrow-x+20=6\)
\(\Rightarrow x=20-6\)
\(\Rightarrow x=14\)
h) \(-\left(-x+13-142\right)+18=55\)
\(\Rightarrow x-13+142+18=55\)
\(\Rightarrow x+147=55\)
\(\Rightarrow x=55-147\)
\(\Rightarrow x=-92\)
Tổng ( hiệu ) sau là số nguyên tố hay hợp số?
a) 3 x 4 x 5 + 6 x 7
b) 7 x 9 x 11 x 13 - 2 x 3 x 4 x 7
c) 3 x 5 x 7 + 11 x 13 x 17
d) 16 354 + 67 541
Bài 1: Tìm số Nguyên x biết:
A,x-12=(-9)-15
B,2-x=17-(-5)
C,11-(15+11)=x-(25-9)
D,x-(17-x)=x-7
E,9-25=(7-x)-(25+7)
G,x-13=21-x
Giúp mình với mình cần gấp lắm!!!
a) Ta có: \(x-12=\left(-9\right)-15\)
\(\Rightarrow x-12=-24\)
\(\Rightarrow x=-12\)
b) \(2-x=17-\left(-5\right)\)
\(\Rightarrow2-x=22\)
\(\Rightarrow x=2-22\)
\(\Rightarrow x=-20\)
c) \(11-\left(15+11\right)=x-\left(25-9\right)\)
\(\Rightarrow-15=x-16\)
\(\Rightarrow x=1\)
d) \(x-\left(17-x\right)=x-7\)
\(\Rightarrow x-17+x=x-7\)
\(\Rightarrow x+x-x=-7+17\)
\(\Rightarrow x=10\)
e) \(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Rightarrow9-25=7-x-25-7\)
\(\Rightarrow-16=-25-x\)
\(\Rightarrow x=-9\)
g) \(x-13=21-x\)
\(\Rightarrow x+x=21+13\)
\(\Rightarrow2x=34\)
\(\Rightarrow x=17\)
a, x - 12 = ( -9 ) - 15
x - 12 = -24
x = -24 + 12
x = -12
b, 2 - x = 17 - ( -5 )
2 - x = 22
x = 2 - 22
x = -20
c, 11 - ( 15 + 11 ) = x - ( 25 - 9 )
11 - 26 = x - 16
-15 = x - 16
x = -15 + 16
x = 1
d, x - ( 17 - x ) = x - 7
x - 17 + x = x - 7
x + x - 17 = x - 7
x + x - x = -7 + 17
x = 10
e.9 - 25 = ( 7- x ) - ( 25 + 7 )
-16 = ( 7 - x ) -32
7 - x = -32 + 16
7 - x = 16
x = 7 - 16
x= -9
g, x - 13 = 21 - x
x + x = 21 + 13
2x = 44
x = 44 : 2
x=22
Tìm các cặp số nguyên (x,y) nguyên biết
(x-13).y-(11+x).7=9(x+11).y-(11+x).7=5(2x-1).y+(1-2x).3=17(x+23).y-x=4(x+5).x.y-x-5=31