Tìm x, biết:
a. \(x - 5,01 = 7,02 - 2.1,5\)
b. \(x:2,5 = 1,02 + 3.1,5\)
bài 7 tìm x
1) x-5,01=7,02-2.1,5
2) x:2,5=1,02+3.1,5
1) x - 5,01 = 7,02 - 2.1,5
x - 5,01 = 4,02
x = 4,02 + 5,01
x = 9,03
2) x : 2,5 = 1,02 + 3.1,5
x : 2,5 = 5,52
x = 5,52 x 2,5
x = 13,8
\(x-5,01=7,02-2.1,5\)
\(\Rightarrow x-5,01=4,02\)
\(\Rightarrow x=4,02+5,01\)
\(\Rightarrow x=9,03\)
x-5,01=7,02-2.1,5
x-5,01=7,02-3
x-5,01=4,02
x=4,02+5,01
x=9,03
BÀI 1:TÌM X BIẾT
X-5,01= 7,02-2.1,5
GIÚP MÌNH ĐC HONG
1) x - 5,01 = 7,02 - 2.1,5
x - 5,01 = 4,02
x = 4,02 + 5,01
x = 9,03
x-5,01=7,02-3
x-5,01=4,02
x=4,02+5,01
x=9,03
Câu 18: Tìm x, biết
a) x - 5,01 = 7,02 - 2.1,5 b) x - 3/10 = 7/15 x 3/5
x-5,01=7,02-2×1,5
x-5,01=1,02+3×1,5
x - 5, 01 = 5,52
x = 5,52 + 5,01
x = 10,53
X-5,01=7,02-2×1,5
Tìm x
a) 1,23 × x - 1,02 × x = 4,2
b) 11,95 - x ÷ 2,5 = 7,35
a, 1,23 * x -1,02 * x = 4,2
\(\Rightarrow x\cdot\left(1,23-1,02\right)=4,2\Rightarrow0,21\cdot x=4,2\Rightarrow x=\frac{420}{100}\div\frac{21}{100}=20\)
b, 11,95-x/2,5=7,35
\(\Rightarrow x\div\frac{25}{10}=11,95-7,35=4,6\Rightarrow x\div\frac{5}{2}=4,6\Rightarrow x=4,6\cdot\frac{5}{2}=\frac{46}{10}\cdot\frac{5}{2}=\frac{23}{5}\cdot\frac{5}{2}=\frac{23}{2}\)
a, 1,23 x X -1,02 x X= 4,2
(1,23-1,02) x 2X =4,2
0,21 x 2X=4,2
2X=4,2:0,21
2X=20
X=20:2
X=10
Vậy X= 10
b, 11,95-X:2,5=7,35
X:2,5=11,95 - 7,35
X:2,5=4,6
X=4,6x2,5
X=11,5
Vậy X= 11,5
Tìm \(x\in Q\), biết:
a, \(\left|2,5-x\right|=1,3\)
b, \(1,6-\left|x-0,2\right|=0\)
a)\(\left[{}\begin{matrix}\dfrac{5}{2}-x=\dfrac{1}{3}\\\dfrac{5}{2}-x=-\dfrac{1}{3}\end{matrix}\right.\left[{}\begin{matrix}x=\dfrac{13}{6}\\x=\dfrac{17}{6}\end{matrix}\right.\)
b) 8/6-x-1/5=0
9/6-x=1/5
x=13/10
a) \(\left|2,5-x\right|=1,3\)
\(\Leftrightarrow\left[{}\begin{matrix}2,5-x=1,3\\2,5-x=-1,3\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1,2\\x=3,8\end{matrix}\right.\)
b) \(1,6-\left|x-0,2\right|=0\)
\(\Leftrightarrow\left|x-0,2\right|=1,6\)
\(\Leftrightarrow\left[{}\begin{matrix}x-0,2=1,6\\x-0,2=-1,6\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1,8\\x=-1,4\end{matrix}\right.\)
Tìm x biết:a)giá trị tuyệt đối của x-2=4 b) x/-2,5=4/5