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a, 1,23 * x - 1,02 * x = 4,2
x * (1,23 - 1,02) = 4,2
x * 0,21 = 4,2
x = 4,2 : 0,21
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 * 2,5
x = 11,5
a) \(1,23.x-1,02.x=4,2\)
\(\Rightarrow x.\left(1,23-1,02\right)=4,2\)
\(\Rightarrow x.0,21=4,2\)
\(\Rightarrow x=4,2:0,21\)
\(\Rightarrow x=20\)
b) \(11,95-x:2,5=7,35\)
\(\Rightarrow x:2,5=11,95-7,35\)
\(\Rightarrow x:2,5=4,6\)
\(\Rightarrow x=4,6.2,5\)
\(\Rightarrow x=11,5\)
a) 1 + 2 + 3 + ....... + x = 1275
<=> ( x + 1 ) . x : 2 = 1275
( x + 1 ) . x = 1275 .2
( x + 1 ) . x = 2550
( x + 1 ) . x = 51 . 50
( x + 1 ) . x = ( 50 + 1 ) . 50
<=> x = 50
b) ( x + 1 ) +( x + 2 ) +..... +( x + 99 ) = 6138
x + 1 + x + 2 + .........+ x + 99 = 6138
99x + ( 1 + 2 + .......... + 99 ) = 6138
99x + 4950 = 6138
99x = 1188
x = 1188 : 99
x = 12
c) x . 1 + x . 2 + ......... + x . 99 = 495
x. ( 1 + 2 + ...... + 99 ) = 495
x . 4950 = 495
x = 495 : 4950
x = 1/10
a: x=1-2/9=7/9
b: x=6/7-2/3=18/21-14/21=4/21
c: x=1/4+1/2=3/4
a)
x + 2/5 = 1/2
x = 1/2 - 2/5
x = 1/10
b)
x + 3/7 = 2/5 + 3/10
x + 3/7 = 7/10
x = 7/10 - 3/7
x = 19/70
c)
19/20 - x = 8/5 - 3/4
19/20 - x = 17/20
x = 19/20 - 17/20
x = 1/5
a) x + 2/5 = 1/2
x = 1/2 - 2/5
x = 3/10
b) x + 3/7 = 2/5 + 3/10
x + 3/7 = 7/10
x = 7/10 - 3/7
x = 19/70
c) 19/20 - x = 8/5 - 3/4
19/20 - x = 17/20
x = 19/20 - 17/20
x = 2/20 = 1/10
a) x - 3/2 = 4/3
x = 4/3 + 3/2
x = 8/6 + 9/6 = 17/6
b) 2/5 * x = 1/3
x = 1/3 : 2/5
x = 1/3 x 5/2 = 5/6
c) x - 4/9 = 3/7 : 9/14
x - 4/9 = 2/3
x = 2/3 + 4/9
x = 6/9 + 4/9 = 10/9
d) 3/5 * x - 1/2 = 1/5
3/5 * x = 1/5 + 1/2 = 7/10
x = 7/10 : 3/5
x = 7/10 * 5/3 = 7/6
a/\(x-\dfrac{3}{2}=\dfrac{4}{3}\)
\(x=\dfrac{4}{3}+\dfrac{3}{2}\)
\(x=\dfrac{17}{6}\)
b/\(\dfrac{2}{5}\times x=\dfrac{1}{3}\)
\(x=\dfrac{1}{3}:\dfrac{2}{5}\)
\(x=\dfrac{5}{6}\)
c/\(x-\dfrac{4}{9}=\dfrac{3}{7}:\dfrac{9}{14}\)
\(x-\dfrac{4}{9}=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}+\dfrac{4}{9}\)
\(x=\dfrac{10}{9}\)
d/\(\dfrac{3}{5}\times x-\dfrac{1}{2}=\dfrac{1}{5}\)
\(\dfrac{3}{5}\times x=\dfrac{1}{5}+\dfrac{1}{2}\)
\(\dfrac{3}{5}\times x=\dfrac{7}{10}\)
\(x=\dfrac{7}{10}:\dfrac{3}{5}\)
\(x=\dfrac{7}{6}\)
x . 1,2 - 3,45 = 4,68
x . 1,2 = 4,68 + 3,45 = 8,13
x = 8,13 : 1,2 = 3,775
x . 1,2 - 3,45 = 4,68
x . 1,2 = 4,68 + 3,45
x . 1,2 = 8,13
x = 8,13 : 1,2
x = 6,775
a)x+1,23=4,56.3
x+1,23=13,68
x=13,68-1,23
x=12,45
b)x-3,45=9,80:2
x-3,45=4,9
x=4,9+3,45
x=8,35
c)x.2=9,87-4,52
x.2=5,35
x=5,35:2
x=2,675