Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(75\%\cdot x+\frac{3}{4}\cdot x+x=30\)
\(x\cdot\left(\frac{3}{4}+\frac{3}{4}+1\right)=30\)
\(x\cdot\frac{5}{2}=30\)
\(x=30\cdot\frac{2}{5}\)
\(x=12\)
Mình không viết lại đề nhé!
a) 27 - x + 15 + x = x + 2
-x + x - x = 2 - 15 - 27
-x = -40
x = 40
b) 8x - 75 = 5x +21
8x - 5x = 21 + 75
3x = 96
x = 32
c) 15 - |2x - 1| = |-8|
15 - 2x + 1 = 8
-2x = 8 -1 -15
-2x = -8
x = 4
d) 9x + 25 = -(2x - 58)
9x + 25 = -2x + 58
9x +2x = 58 - 25
7x = 33
x = 33/7
4x - 15 = - 75 - x
=> 4x + x = - 75 + 15
=> 5x = - 60
=> x = - 12
vậy_
72 - 3x = 5x + 8
=> - 3x - 5x = 8 - 72
=> - 8x = - 64
=> x = 8
vậy_
\(4x-15=-75-x\)
\(\Leftrightarrow4x+x=-75+15\)
\(\Leftrightarrow5x=-60\Leftrightarrow x=-12\)
a) \(\left(4\frac{1}{2}-2x\right)\cdot3\frac{2}{3}=\frac{11}{5}\)
\(\left(\frac{9}{2}-2x\right)=\frac{11}{5}\cdot\frac{3}{11}\)
\(2x=\frac{45-6}{10}\)
\(2x=\frac{39}{10}\)
\(x=\frac{39}{10\cdot2}=\frac{39}{20}\)
b) \(\frac{3}{4}\cdot x+\frac{4}{7}\cdot x=-\frac{15}{8}\)
\(x\cdot\left(\frac{21+16}{28}\right)=-\frac{15}{8}\)
\(x=-\frac{15}{8}\cdot\frac{28}{37}\)
\(x=-\frac{105}{74}\)
a) ( x - 15 ) - 75 = 0
<=> x - 15 = 75
<=> x = 90
b) 575 - ( 6x + 70 ) = 445
<=> 6x + 70 = 130
<=> 6x = 60
<=> x = 10
c) 315 + ( 125 - x ) = 435
<=> 125 - x = 120
<=> x = 5
13/ 75 :(x+2)=53-(34-1).23
15/ (23+ 3)(x-5)+14=52 + 124 : 23
giúp mk với nhé AI NHANH NHẤT MK TÍCH CHO
=8/15:(10/30-36/30+25/30)+8/15*4*3/4
=8/15:(-1/30)+8/15*3
=8/15(-30+3)
=8/15*(-27)=-14,4
\(\frac{2}{x}=\frac{y}{15}=\frac{\left(-25\right)}{75}\)
\(\Rightarrow\frac{y}{15}=\frac{\left(-1\right)}{3}\)
\(\frac{y}{15}=\frac{\left(-5\right)}{15}\)
\(\Rightarrow15y=15\times\left(-5\right)\)
\(15y=\left(-75\right)\)
\(y=\left(-75\right)\div15\)
\(y=\left(-5\right)\)
\(\Rightarrow\frac{2}{x}=\frac{\left(-5\right)}{15}\)
\(\frac{2}{x}=\frac{\left(-1\right)}{3}\)
\(\Rightarrow-x=3\times2\)
\(-x=6\)
\(x=\left(-6\right)\)
\(V\text{ậy}x=\left(-6\right);y=\left(-5\right)\)
-75+(-49)+|75|+49-12
= -75-49+75+49-12
= (-75+75) +( -49+49) -12
= 0+0+(-12)
=-12
4x - 15 = -75 - x
4x + x = -75 + 15
5x = -60
x = -60/5
x = -12
\(4\times x-15=-75-x\)
\(\Leftrightarrow4x-15+75=-x\)
\(\Leftrightarrow4x+60=-x\)
\(\Leftrightarrow60=-x-4x\)
\(\Leftrightarrow60=-5x\)
\(\Leftrightarrow x=-12\)
Vậy \(x=-12\)