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\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(b\right)y\times1,02=3,57\times3,06\)
\(\Leftrightarrow y\times1,02=10,9242\)
\(\Leftrightarrow y=10,9242\div1,02\)
\(\Leftrightarrow y=10,71\)
\(\left(c\right)15\div y-0,85=0,35\)
\(\Leftrightarrow15\div y=0,35+0,85\)
\(\Leftrightarrow15\div y=1,2\)
\(\Leftrightarrow y=15\div1,2\)
\(\Leftrightarrow y=12,5\)
\(\left(d\right)471,5-22,5\times y=12,5\)
\(\Leftrightarrow22,5\times y=471,5-12,5\)
\(\Leftrightarrow22,5\times y=459\)
\(\Leftrightarrow y=459\div22,5\)
\(\Leftrightarrow y=20,4\)
Kukad'z Lee'z
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
x+4x( x-15 )=50
x+4X-60=50
X(4+1)=50+50
X5=110
X= 110:5
x=22
ai k mk mk sẽ k lại @!@#$@ ủng hộ nha ^_^
X = \(\left(\frac{63}{5\cdot6}-\frac{1}{8}\cdot8+\frac{2}{15}\cdot\frac{3}{100}\right)\cdot\frac{11}{4}\)
X = \(\left(\frac{21}{10}-1+\frac{1}{250}\right)\cdot\frac{11}{4}\)
X = \(\left(\frac{525}{250}-\frac{250}{250}+\frac{1}{250}\right)\cdot\frac{11}{4}\)
X = \(\frac{276}{250}\cdot\frac{11}{4}\)
X = \(\frac{759}{250}\)
3/4 * x + 1/2 * x -15 = 35
3/4 * x +1/2 * x = 35 + 15
3/4 * x +1/2 * x = 50
x * ( 3/4 + 1/2 ) = 50
x * 5/4 = 50
x = 50 : 5/4
x = 40
phan b mik ko nhap dc nen bn tu lm nha
a, \(\frac{3}{4}\times x+\frac{1}{2}\times x-15=35\)
\(x+x-15=\frac{3}{4}-\frac{1}{2}\)
\(x+x-15=\frac{2}{8}=\frac{1}{4}\)
\(x=35-15\)
\(x=20\)
Vậy \(x=\frac{1}{4}\)và \(x=20\)
b, Chịu
15/18 = 5/6 ( rút gọn chia cả tử và mẫu cho 3 )
5/x+1 = 5/6 Nên tử giữ nguyên , X là : 6- 1 = 5
được 5/5+1 = 15/18
a. 2x.4=128
2x =32
=> x = 5
b. 2x+1=125
2x = 125-1
2x = 124
x = 62
c. x15=x
=> x \(\in\left\{0;\pm1\right\}\)
15 : x = 0,85 + 0,35
15 : x = 1,2
x = 15 : 1,2
x = 12,5