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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
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
y x 6 - 4,99 = 25
y x 6=25+4,99=29,99
y=29,99:6=4.9983.......
\(\Leftrightarrow4,5x-0,5x=2,6\)
\(\Leftrightarrow4x=2,6\)
\(\Leftrightarrow x=0,65\)
8, 4 : X = 6
X = 8, 4 : 6
X = 1, 4
0, 1 x X = 1/2
X = 1/2 : 0, 1
X = 5
\(\frac{2}{3\times5}\times a+\frac{2}{5\times7}\times a+...+\frac{2}{13\times15}\times a=\frac{28}{15}\)
=> \(\left(\frac{2}{3\times5}+\frac{2}{5\times7}+...+\frac{2}{13\times15}\right)\times x=\frac{28}{15}\)
=> \(\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{13}-\frac{1}{15}\right)\times x=\frac{28}{15}\)
=> \(\left(\frac{1}{3}-\frac{1}{15}\right)\times x=\frac{28}{15}\)
=> \(\frac{4}{15}\times x=\frac{28}{15}\)
=> \(x=\frac{28}{15}:\frac{4}{15}\)
-> \(x=7\)
\(\frac{2}{3\times5}\times a+\frac{2}{5\times7}\times a+...+\frac{2}{13\times15}\times a=\frac{28}{15}\)
\(a\times\left(\frac{2}{3\times5}+\frac{2}{5\times7}+...+\frac{2}{13\times15}\right)=\frac{28}{15}\)
\(a\times\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{13}-\frac{1}{15}\right)=\frac{28}{15}\)
\(a\times\left(\frac{1}{3}-\frac{1}{15}\right)=\frac{28}{15}\)
\(a\times\frac{4}{15}=\frac{28}{15}\)
\(a=\frac{28}{15}:\frac{4}{15}\)
\(a=\frac{28}{15}\times\frac{25}{4}\)
\(a=\frac{28}{4}=7\)
X x 6 + X : 0,125 - X : 0,25 = 352
X x 6 + X x 8 - X x 4 = 352
X x (6 + 8 - 4) = 352
X x 10 = 352
x = 352 : 10
x = 35,2
+) 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.