a) X-4,2=58,4-24,9
X-4,2= 33,5
X= 33,5+4,2
X=37,7
b) \(\frac{4}{5}-X=\frac{1}{5}+\frac{2}{7}\)
\(\frac{4}{5}-X=\frac{17}{35}\)
\(X=\frac{4}{5}-\frac{17}{35}\)
\(X=\frac{5}{7}\)
c)\(X-140:35=270\)
\(X-4=270\)
X=274
d) 3.X + 2.X = 25
X.(3+2) = 25
X = 25:(3+2)
X=5
a) b) \(\frac{4}{5}-x=\frac{1}{5}+\frac{2}{7}\)
x – 4,2 = 58,4 – 24,9 \(\frac{4}{5}-x=\frac{17}{35}\)
x – 4,2 = 33,5 \(x=\frac{4}{5}-\frac{17}{35}\)
x = 33,5 + 4,2 \(x=\frac{11}{35}\)
x = 37,7
c) d) \(3\times x+2\times x=25\)
x – 140 : 35 = 270 \(x\times\left(3+2\right)=25\)
x - 4 = 270 \(x\times5=25\)
x = 270 + 4 \(x=25\div5\)
x = 274 \(x=5\)
a)
x – 4,2 = 58,4 – 24,9
x – 4,2 = 33,5
x = 33,5 + 4,2
x = 37,7
c)
x – 140 : 35 = 270
x - 4 = 270
x = 270 + 4
x = 274
a/ X - 4,2 = 58,4 - 24,9
X - 4,2 = 33,5
X = 33,5 + 4,2
X = 37,7
Vậy X = 37,7.
b/ \(\frac{4}{5}\)- X = \(\frac{1}{5}\)+ \(\frac{2}{7}\)
\(\frac{4}{5}\)- X = \(\frac{17}{35}\)
X = \(\frac{4}{5}\)- \(\frac{17}{35}\)
X = \(\frac{11}{35}\)
Vậy X =\(\frac{11}{35}\)
c/ X - 140 : 35 = 270
X - 4 = 270
X = 270 + 4
X = 274
Vậy X = 274
d/ 3 x X + 2 x X = 25
X x ( 3 + 2 ) = 25
X x 5 = 25
X = 25 : 5
X = 5
Vậy X = 5
Nếu thấy đúng thì mk nha!!!!
a) x - 4,2 = 58,4 - 24,9
x - 4,2 = 33,5
x = 33,5 + 4,2
x = 37,7
b) \(\frac{4}{5}\)- x = \(\frac{1}{5}\)+ \(\frac{2}{7}\)
\(\frac{4}{5}\)- x = \(\frac{17}{35}\)
x = \(\frac{4}{5}\)- \(\frac{17}{35}\)
x = \(\frac{11}{35}\)
c) x - 140 : 35 = 270
x - 4 = 270
x = 270 + 4
x = 274
d) 3.x + 2.x = 25
( 3 + 2 ) . x = 25
5 . x = 25
x = 25 : 5
x = 5
a) x – 4,2 = 58,4 – 24,9
x – 4,2 = 33,5
x = 33,5 + 4,2
x = 37,7
c) x – 140 : 35 = 270
x - 4 = 270
x = 270 + 4
x = 274