bài 7 tìm x
1) x-5,01=7,02-2.1,5
2) x:2,5=1,02+3.1,5
Tìm x, biết:
a. \(x - 5,01 = 7,02 - 2.1,5\)
b. \(x:2,5 = 1,02 + 3.1,5\)
a,
\(\begin{array}{l}x - 5,01 = 7,02 - 2.1,5\\x - 5,01 = 7,02 - 3\\x - 5,01 = 4,02\\x = 4,02 + 5,01\\x = 9,03\end{array}\)
Vậy \(x=9,03\)
b,
\(\begin{array}{l}x:2,5 = 1,02 + 3.1,5\\x:2,5 = 1,02 + 4,5\\x:2,5 = 5,52\\x = 5,52.2,5\\x = 13,8\end{array}\)
Vậy \(x=13,8\).
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
\(x-5,01=7,02-2.1,5\)
\(\Rightarrow x-5,01=4,02\)
\(\Rightarrow x=4,02+5,01\)
\(\Rightarrow x=9,03\)
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
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
Câu 18: Tìm x, biết
a) x - 5,01 = 7,02 - 2.1,5 b) x - 3/10 = 7/15 x 3/5
a) 1,23 x X -1,02 x X=4,2 ,11,95 - X : 2,5 = 7,35
a) 1,23 x X - 1,02 x X = 4,2
=> (1,23-1,02) x X = 4,2
=> 0,21 x X = 4,2
=> X = 4,2 : 0,21
=> X = 20
Vậy X = 20
b) 11, 95 - X : 2,5 = 7,35
=> X : 2,5 = 11,95 - 7,35
=> X : 2,5 = 4,6
=> X = 4,6 x 2,5
=> X = 28,75
Vậy X = 28,75
HT
X÷2,5=1,02+3×1,5
\(x:2,5=1,02+3\times1,5\\ \Rightarrow x:2,5=1,02+4,5\\ \Rightarrow x:2,5=5,52\\ \Rightarrow x=5,52\times2,5\\ \Rightarrow x=13,8\)
=>x:2,5=1,02+4,5=5,52
hay x=13,8
\(x:\dfrac{5}{2}=1,02+3.1,5=1,02+4,5=5,52\Leftrightarrow x=13,8\)