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a ) X x 6 - 4,99 = 25,01 b ) X : 6 = 7/4
X x 6 = 25,01 + 4,99 X : 6 = 1,75
X x 6 = 30 X = 1,75 x 6
X = 30 : 6 X = 10,5
X = 5
+) Ta có: \(x\times6-4,99=25,01\)
\(x\times6=30\)
\(x=5\)
+) Ta có: \(\left(x+8,4\right):5=2,2\)
\(x+8,4=11\)
\(x=2,6\)
X x 6 - 4,99 = 25,01
X x 6 = 25,01 + 4,99
X x 6 = 30
X = 30 : 6
X = 5
Vậy X = 5.
( x + 8,4 ) : 5 = 2,2
x + 8,4 = 2,2 x 5
x + 8,4 = 11
x = 11 - 8,4
x = 2,6
Vậy x = 2,6.
y x 6 - 4,99 = 25
y x 6=25+4,99=29,99
y=29,99:6=4.9983.......
\(y.3\dfrac{7}{12}=6\dfrac{1}{4}\)
\(y.\dfrac{43}{12}=\dfrac{25}{4}\)
\(y=\dfrac{25}{4}:\dfrac{43}{12}\)
\(y=\dfrac{25.12}{4.43}\)
\(y=\dfrac{75}{43}\)
\(6-2\left(x-1\right)=4\)
\(\Rightarrow2\left(x-1\right)=6-4\)
\(\Rightarrow2\left(x-1\right)=2\)
\(\Rightarrow x-1=1\)
\(\Rightarrow x=1+1=2\)
________________
\(2\cdot\left(x-2\right)+1=7\)
\(\Rightarrow2\cdot\left(x-2\right)=7-1\)
\(\Rightarrow2\cdot\left(x-2\right)=6\)
\(\Rightarrow x-2=3\)
\(\Rightarrow x=3+2=5\)
_______________
\(\left(2\cdot x-3\right)+4=9\)
\(\Rightarrow2\cdot x-3=5\)
\(\Rightarrow2\cdot x=3+5\)
\(\Rightarrow2\cdot x=8\)
\(\Rightarrow x=\dfrac{8}{2}=4\)
________________
\(\left(3\cdot x-2\right)-1=3\)
\(\Rightarrow3\cdot x-2=3+1\)
\(\Rightarrow3\cdot x-2=4\)
\(\Rightarrow3\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{3}=2\)
a: =>2(x-1)=2
=>x-1=1
=>x=2
b: =>2(x-2)=6
=>x-2=3
=>x=5
c; =>2x-3=5
=>2x=8
=>x=4
d: =>3x-2=4
=>3x=6
=>x=2
e: =>2(6-x)=4
=>6-x=2
=>x=4
f: =>x-2=5
=>x=7
g: =>10-2x=4
=>2x=6
=>x=3
h: =>2x+4=3
=>2x=-1
=>x=-1/2
j: =>x+2=12
=>x=10
l: =>2x+3=3
=>2x=0
=>x=0
a:y x 6 = 25,01 + 4,99
y x 6 = 30
y = 30 : 6
y = 5
b: y : 6 = 1,75
y = 1,75 x 6
y = 10,5
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