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để mk dịch trước cho các bạn làm cho dễ nha, hơi hại não tí
tìm y
y + y x 1/3 : 2/9 + y : 2/7 = 252
là vậy đúng ko
y + y x 1/3 : 2/9 + y : 2/7 = 252
y x 1 + y x 1/3 : 2/9 + y : 2/7 = 252
y x 1 + y x 1/3 x 9/2 + y x 7/2 = 252
y x ( 1 + 1/3 + 7/2 ) x 9/2 = 252
y x ( 1 + 1/3 + 7/2 ) = 252 : 9/2
y x ( 1 + 1/3 + 7/2 ) = 9/504
y x 26/6 = 9/504
y = 9/504 : 26/6
y = 3/728
\(y:\frac{3}{8}=\frac{12}{7}\)
\(y=\frac{12}{7}\times\frac{3}{8}\)
\(y=\frac{9}{14}\)
\(y-\frac{7}{2}=1\)
\(y=1+\frac{7}{2}\)
\(y=\frac{9}{2}\)
y : \(\frac{3}{8}\)= \(\frac{12}{7}\) y - \(\frac{7}{2}\)= 1
y = \(\frac{12}{7}x\frac{3}{8}\) y = 1 + \(\frac{7}{2}\)
y = \(\frac{9}{14}\) y = \(\frac{9}{2}\)
Lời giải:
$y: \frac{1}{8}+y\times 92=20100$
$y\times 8+y\times 92=20100$
$y\times (8+92)=20100$
$y\times 100=20100$
$y=20100:100=201$
-------------------
$y: \frac{1}{25}+y\times 75=25000$
$y\times 25+y\times 75=25000$
$y\times (25+75)=25000$
$y\times 100=25000$
$y=25000:100=250$
a) 7/10 - y × 3/4 = 1/5
y × 3/4 = 7/10 - 1/5
y × 3/4 = 1/2
y = 1/2 : 3/4
y = 2/3. Vậy y = 2/3
b) 5/6 : ( y + 7/9 ) = 3/4
y + 7/9 = 5/6 : 3/4
y + 7/9 = 10/9
y. = 10/9 - 7/9
y = 1/3. Vậy y = 1/3
\(\frac{7}{10}\)- y * \(\frac{3}{4}\)= \(\frac{1}{5}\)
y * \(\frac{3}{4}\)= \(\frac{7}{10}\)- \(\frac{1}{5}\)
y * \(\frac{3}{4}\)= \(\frac{1}{2}\)
y = \(\frac{1}{2}\): \(\frac{3}{4}\)
y = \(\frac{2}{3}\)
Vậy y = \(\frac{2}{3}\)
\(\frac{5}{6}\): ( y + \(\frac{7}{9}\)) = \(\frac{3}{4}\)
y + \(\frac{7}{9}\) = \(\frac{5}{6}\): \(\frac{3}{4}\)
y + \(\frac{7}{9}\) = \(\frac{10}{9}\)
y = \(\frac{10}{9}\)- \(\frac{7}{9}\)
y = \(\frac{3}{9}\)
Vậy y = \(\frac{3}{9}\)
đéch hiểu