Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(15-2.x=25\)
\(2.x=15-25=-10\)
\(x=\left(-10\right)\div2=-5\)
\(31-\left(17+x\right)=18\)
\(\left(17+x\right)=31-18=13\)
\(x\) \(=13-17=-4\)
15−2.x=2515−2.x=25
2.x=15−25=−102.x=15−25=−10
x=(−10)÷2=−5x=(−10)÷2=−5
31−(17+x)=1831−(17+x)=18
(17+x)=31−18=13(17+x)=31−18=13
xx =13−17=−4
1:
a: \(=\dfrac{-4}{7}+\dfrac{4}{7}+\dfrac{3}{7}-\dfrac{23}{34}-\dfrac{4}{5}=\dfrac{3}{7}-\dfrac{23}{34}-\dfrac{4}{5}=-\dfrac{1247}{1190}\)
b:
Sửa đề: \(\dfrac{-5}{13}+\dfrac{4}{19}+\dfrac{-8}{13}+\dfrac{15}{19}+\dfrac{45}{6}\)
\(=\dfrac{-5}{13}-\dfrac{8}{13}+\dfrac{4}{19}+\dfrac{15}{19}+\dfrac{45}{6}=\dfrac{9}{2}\)
a) \(4x+4=16\)
\(4x=12\)
\(x=3\)
b) \(34\left(2x-6\right)=0\)
\(2x=6\)
\(x=3\)
c) \(15:x=5\)
\(x=15:5=3\)
d) \(20-\left(x+14\right)=5\)
\(x+14=20-5=15\)
\(x=15-14=1\)
a) \(4x+4=16\)
\(\Rightarrow4x=16-4\)
\(\Rightarrow4x=12\)
\(\Rightarrow x=\dfrac{12}{4}\)
\(\Rightarrow x=3\)
b) \(34\cdot\left(2x-6\right)=0\)
\(\Rightarrow2x-6=\dfrac{0}{36}\)
\(\Rightarrow2x-6=0\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=\dfrac{6}{2}\)
\(\Rightarrow x=3\)
c) \(15:x=5\)
\(\Rightarrow x=15:5\)
\(\Rightarrow x=3\)
d) \(20-\left(x+14\right)=5\)
\(\Rightarrow x+14=20-5\)
\(\Rightarrow x+14=15\)
\(\Rightarrow x=15-14\)
\(\Rightarrow x=1\)
a) ( x - 34 ) . 15 = 0
=> x - 34 = 0
=> x = 34
b) 18.(x-16) = 18
=> x - 16 = 1
=> x = 1 + 16
=> x = 17
a) ( x - 34 ) . 15 = 0
=> x - 34 = 0 : 15
=> x - 34 = 0
=> x = 34
b) 18.(x-16) = 18
=> x - 16 = 18 : 18
=> x - 16 = 1
=> x = 1 + 16
=> x = 17
c) 2x+(15-(7-4)2)=24.3
2x+(15-32)=16.3
2x+(15-9)=48
2x+6=48
2x=48-6
2x=42
x=42:2
x=21
Vậy...
a, 17+(-x)=-16-(-34)
<=> 17+(-x)= - 50
=> -x= - 33
=> x= 33
b, x-40=9.(-5)+9
<=> x-40= -36
=> x= 4
c, 2x + [ 15 - ( 7 - 4 ) 2 ] = 24 . 3
<=> 2x+ [ 15- 32 ] = 48
<=> 2x+4=48
=>2x=44
=>x=22
d, 1125-10x-3 = 152 - 102
=> 1125 - 10x-3 = 125
=> 10x-3 = 1000
=> 10x-3= 103
=> x-3=3
=>x=6
a)(x-34).15=0
\(\left(x-34\right)0:15=0\)
= \(\left(x-34\right)=0\Rightarrow x=0+34=34\)
B) 18.(x-16)=18
( x - 16 ) = 18 : 18
( x - 16 ) = 1
=> x = 1 + 16
= 17
\(a.\left(x-34\right).15=0\)
\(x-34=0:15\)
\(x-34=0\)
\(x=0+34\)
\(x=34\)
\(284:\left[314-\left(x+3\right)\right]=12.\)
\(\Leftrightarrow\left[314-\left(x+3\right)\right]=\frac{71}{3}\)
\(\Leftrightarrow\left(x+3\right)=\frac{871}{3}\)
\(\Leftrightarrow x=\frac{862}{3}\)
\(14.\left[251-\left(x-5\right)\right]=1470\)
\(\Leftrightarrow\left[251-\left(x-5\right)\right]=105\)
\(\Leftrightarrow x-5=146\)
\(\Leftrightarrow x=151\)
\(\left(120+x\right):x-15=16\)
\(\Leftrightarrow\left(120+x\right):x=31\)
\(\Leftrightarrow\left(120+x\right).\frac{1}{x}=31\)
\(\Leftrightarrow\frac{1}{x}.x+120x=31\)
\(\Leftrightarrow1+120x=31\)
\(\Leftrightarrow120x=30\)
\(\Leftrightarrow x=4\)
\(\left(135-x\right):x+24=28\)
\(\Leftrightarrow\left(135-x\right):x=4\)
\(\Leftrightarrow\left(135-x\right).\frac{1}{x}=4\)
\(\Leftrightarrow\frac{1}{x}.135-\frac{1}{x}x=4\)
\(\Leftrightarrow\frac{1}{x}135-1=4\)
\(\Leftrightarrow\frac{1}{x}135=5\)
\(\Leftrightarrow\frac{1}{x}=\frac{1}{27}\)
\(\Leftrightarrow x=27\)
( x - 34 ) . 15 = 0
x - 34 = 0 : 15
x - 34. = 0
x. = 0 + 34
x. = 34
18 . ( x - 16 ) = 18
x - 16. = 18 : 18
x - 16. = 1
x = 1 + 16
x = 17
Chúc bn hok tốt ~
t mk nha cảm ơn
( x - 34 ). 15=0
x-34 = 0.15
x-34 = 0
x = 34+0
x = 34
18.(x-16) = 18
x-16 = 18:18
x-16 = 1
x = 16 + 1
x = 17
*******************CHÚC BẠN HỌC TỐT ***************