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3/25 x ( 15/7 - 2/7 ) + 3/7 x 1/25
= 3/25 x 13/7 + 3/7 x 1/25
= (3 x 13/7 + 3/7 ) x 1/25
= 42/7 x 1/25
= 6 x 1/25
= 6/25
\(\dfrac{3}{25}\times\dfrac{15}{7}+\dfrac{3}{7}\times\dfrac{1}{25}-\dfrac{2}{7}\times\dfrac{3}{25}\)
\(=\dfrac{3}{25}\times\left(\dfrac{15}{7}-\dfrac{2}{7}\right)+\dfrac{3}{7}\times\dfrac{1}{25}\)
\(=\dfrac{3}{25}\times\dfrac{13}{7}+\dfrac{3}{7}\times\dfrac{1}{25}\)
\(=\dfrac{3\times13}{25\times7}+\dfrac{3\times1}{7\times25}\)
\(=\dfrac{39}{175}+\dfrac{3}{175}\)
\(=\dfrac{39+3}{175}\)
\(=\dfrac{42}{175}\)
\(=\dfrac{6}{25}\)
\(\text{ abc x 25 = 9abc}\)
\(\text{abc x 25 = 9000 + abc}\)
\(\text{abc x 24 = 9000}\)
\(\text{ abc = 9000 : 24 abc = 375}\)
abc x 25 = 9abc
abc x 25 = 9000 + abc
abc x 24 = 9000
abc = 375
vậy số cần tìm là 375
[25*18-X]:2/5=200:40/100
[25*18-X]:2/5=200*100/40
[25*18-X]:2/5=15/2
25*18-X=15/2*2/5
25*18-X=3
18-X=3:25
X=18-3/25
X=17 và 22/25 ( hỗn số)
7,15 : 0,5 + 7,15 * 12 - 7,15 : 25 %
=7,15 : 5/10 + 7,15 * 12 -7,15 : 25/100
=7,15 * 10/5 +7,15 * 12 -7,15 * 25/100
=7,15 * 2 + 7,15 * 12 - 7,15 *4
=7,15 * ( 2+12-4)
=7,15 * 10
=71,,5
25%=25/100=1/4=0,25
X*(9,75+0,25)=48,35
X*10=48,35
X=48,35:10
X=4,835
nhớ k nha
\(x\times9,75+25\%\times x=48,35\)
\(\Leftrightarrow x\times9,75+\frac{25}{100}\times x=48,35\)
\(\Leftrightarrow x\times\left(9,75+\frac{25}{100}\right)=48,35\)
\(\Leftrightarrow x\times\left(9,75+0,25\right)=48,35\)
\(\Leftrightarrow x\times10=48,35\)
\(\Leftrightarrow x=48,35:10\)
\(\Leftrightarrow x=4,835\)
25 + ( 15 + x) = 125
15 + x = 125 - 25
15 + x = 100
x = 100 - 15
x = 85
15 + 25 : x = 25
25 : x = 25 - 15
25 : x = 10
x = 25 : 10
x = \(\frac{25}{10}\)
15+25:x=25
25:x=25-15
25:x=10
x=25:10
x=2,5