Tìm x, biết:
a)x:10-0,6=45 b)(x+3,5):7,7=30,6
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a) x:10-0,6=45
x:10=45+0,6
x:10=45,6
x=45,6.10
x=456
vậy x=456
b) (x+3,5):7,7=30,6
x+3,5=30,6.7,7
x+3,5=235,62
x=235,62-3,5
x=232,12
vậy x=232,12
a) X : 10 - 0,6 = 45
X : 10 = 45 + 0,6
X : 10 = 45,6
X = 45,6 x 10
X = 456
b) (X + 3,5) : 7,7 = 30,6
X + 3,5 = 30,6 x 7,7
X + 3,5 = 235,62
X = 235,62 - 3,5
X = 232,12
a)X;10=45+0.6
X;10=45.6
X=45.6/10=4.56
B)X+3.5=30.6x7.7
X+3.5=235.62
X=235.62-3.5=232.12
d: Ta có: (-4,6)+x=-3,5
nên x=-3,5+4,6
hay x=1,1
a: Ta có: \(1.5-\left|x-0.3\right|=0\)
\(\Leftrightarrow\left|x-0.3\right|=1.5\)
\(\Leftrightarrow\left[{}\begin{matrix}x-0.3=1.5\\x-0.3=-1.5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1.8\\x=-1.2\end{matrix}\right.\)
( y + 3,5) : 7,7 = 30,6
y + 3,5 = 30,6 * 7,7
y + 3,5 = 235,62
y = 235, 62 - 3,5
y = 232,12
k nhé
a)(x+35):7,7=30,6
=>x+35=235,62
=>x=200,62
b)470,04:x-5=19
=>470,04:x =24
=>x=19,585
c)12-x:7,5=4,2
=>x:7,5= 7,8
=>x=58,5
`#Ya`
\(a ) ( x + 3 , 5 ) : 7 , 7 = 137 , 7 : 4 , 5\)
\(( x + 3 , 5 ) : 7 , 7 = 30 , 6\)
\(x + 3 , 5 = 30 , 6 × 7 , 7\)
\(x + 3 , 5 = 235 , 62\)
\(x = 235 , 62 − 3 , 5\)
\(x = 232 , 12\)
\(− − − − − − − − − − − − \)
\(x : ( 30 × 4 ) = 7 , 8\)
\(x : 120 = 7 , 8\)
\(x = 7 , 8 × 120\)
\(x = 936\)
a, 35 - \(x\) < 35 - 5
35 - \(x\) < 30
\(x\) < 35 - 30
\(x\) < 5
\(x\) = 1; 2; 3; 4; 5
b, \(x\) - 10 < 35 - 10
\(x\) - 10 < 15
\(x\) < 15 + 10
\(x\) < 25
\(x\) = 0; 1; 2; 3; 4; 5; ....;24
c, \(x\) - 10 < 45
\(x\) < 45 + 10
\(x\) < 55
\(x\) = 0; 1; 2; 3; 4;...;54
a) \(1\frac{2}{7} = 1 + \frac{2}{7} = \frac{9}{2}\)
\(\begin{array}{l}x:1\frac{2}{7} = - 3,5\\x:\frac{9}{7} = - \frac{7}{2}\\x = - \frac{7}{2}.\frac{9}{7}\\x = - \frac{9}{2}\end{array}\)
b) \(0,4.x - \frac{1}{5}.x = \frac{3}{4}\)
\(\begin{array}{l}\frac{2}{5}.x - \frac{1}{5}.x = \frac{3}{4}\\\left( {\frac{2}{5} - \frac{1}{5}} \right).x = \frac{3}{4}\\\frac{1}{5}.x = \frac{3}{4}\\x = \frac{3}{4}:\frac{1}{5}\\x = \frac{3}{4}.5\\x = \frac{{15}}{4}\end{array}\)
a) \(x:10-0,6=45\)
\(=>x:10=45+0,6\)
\(=>x:10=45,6\)
\(=>x=45,6\times10\)
\(=>x=456\)
b) \(\left(x+3,5\right):7,7=30,6\)
\(=>x+3,5=30,6\times7,7\)
\(=>x+3,5=235,62\)
\(=>x=235,62-3,5\)
\(=>x=232,12\)
a) x:10−0,6=45�:10−0,6=45
=>x:10=45+0,6=>�:10=45+0,6
=>x:10=45,6=>�:10=45,6
=>x=45,6×10=>�=45,6×10
=>x=456=>�=456
b) (x+3,5):7,7=30,6(�+3,5):7,7=30,6
=>x+3,5=30,6×7,7=>�+3,5=30,6×7,7
=>x+3,5=235,62=>�+3,5=235,62
=>x=235,62−3,5=>�=235,62−3,5
=>x=232,12