Tìm x: 250- X + 65= 150
......................................
Mình cần gấp
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(128\times\left(\frac{3}{2x}-\frac{1}{4}\right)^3=-250.\)
\(\left(\frac{3}{2x}-\frac{1}{4}\right)^3=-250\div128\)
\(\left(\frac{3}{2x}-\frac{1}{4}\right)^3=\frac{125}{64}\)
\(\left(\frac{3}{2x}-\frac{1}{4}\right)^3=\left(\frac{5}{4}\right)^3\)
\(\Rightarrow\frac{3}{2x}-\frac{1}{4}=\frac{5}{4}\)
\(\Rightarrow\frac{3}{2x}=\frac{5}{4}+\frac{1}{4}\)
\(\Rightarrow\frac{3}{2x}=\frac{3}{2}\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=1\)
\(128x\left(\frac{3}{2}X-\frac{1}{4}\right)^3=-250\)
\(\left(=\right)\left(\frac{3}{2}X-\frac{1}{4}\right)^3=-250:128\)
\(\left(=\right)\left(\frac{3}{2}X-\frac{1}{4}\right)^3=-\frac{125}{64}\)
\(\left(=\right)\left(\frac{3}{2}X-\frac{1}{4}\right)^3=\left(-\frac{5}{4}\right)^3\)
\(\left(=\right)\frac{3}{2}X-\frac{1}{4}=-\frac{5}{4}\)
\(\left(=\right)\frac{3}{2}X=-\frac{5}{4}+\frac{1}{4}\)
\(\left(=\right)\frac{3}{2}X=-\frac{4}{4}\)
\(\left(=\right)\frac{3}{2}X=-1\)
\(\left(=\right)X=-1:\frac{3}{2}\)
\(\left(=\right)X=-\frac{2}{3}\)
Vậy \(X=-\frac{2}{3}\)
ta có
\(20\times x-\left(1+2+..+20\right)=150\)
\(\Leftrightarrow20\times x-20\times\frac{21}{2}=150\)
\(\Leftrightarrow20\times x-210=150\Leftrightarrow20x=360\)
hay x=18
Trả lời :
Ta có :
\(20\times x-\left(1+2+...+20=150\right)\)
\(\Leftrightarrow20\times x-20\times\frac{21}{2}=150\)
\(\Leftrightarrow20\times x-210=150\)
\(\Leftrightarrow20x=360\)
\(\Rightarrow x=18\)
a) -12.(x - 5) + 7(3 - x) = 5
=> -12x + 60 + 21 - 7x = 5
=> -19x + 81 = 5
=> -19x = 5 - 81
=> -19x = -76
=> x = -76 : (-19)
=> x = 4
b) (x + 1) + (x + 2) + (x + 3) + ... + (x + 20) = 250
=> (x + x + x + ... + x) + (1 + 2 + 3 + ... + 20) = 250
=> 20x + 210 = 250
=> 20x = 250 - 210
=> 20x = 40
= > x = 40 : 20
=> x = 2
\(-12\left(x-5\right)+7\left(3-x\right)=5\)
\(\Leftrightarrow-12x+60+21-7x=5\)
\(\Leftrightarrow-19x+81=5\)
\(\Leftrightarrow81-5=19x\)
\(\Leftrightarrow19x=76\)
\(\Leftrightarrow x=4\)
\(25.\left(x+3\right)=250\)
\(x+3=250:25\)
\(x+3=10\)
\(x=10-3\)
\(\Rightarrow x=7\)
a) 576 : x - 30 = 2
576 : x = 2 + 30
576 : x = 32
x = 576 : 32
x = 18
b) 180 - ( x - 45 ) : 2 = 120
( x - 45 ) : 2 = 180 - 120
( x - 45 ) : 2 = 60
x - 45 = 60 * 2
x - 45 = 120
x = 120 + 45
x = 165
a﴿ 576 : x ‐ 30 = 2
576 : x = 2 + 30
576 : x = 32
x = 576 : 32
x = 18
b﴿ 180 ‐ ﴾ x ‐ 45 ﴿ : 2 = 120
﴾ x ‐ 45 ﴿ : 2 = 180 ‐ 120
﴾ x ‐ 45 ﴿ : 2 = 60
x ‐ 45 = 60 * 2
x ‐ 45 = 120
x = 120 + 45
x = 165
250-X=150+50
250-X=200
X=200+250
X=450
=450