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a) y + 3/7 x 21/9 = 5
y + 3/7 x 7/3 = 5
y + 1 = 5
y = 4
b) y x 3/5 - 1/2 = 4/5
y x 3/5 = 4/5 + 1/2
y x 3/5 = 13/10
y = 13/6
c) 9/8 - y + 2/5 = 1/4
y - 2/5 = 9 /8 - 1/4
y - 2/5 = 7/8
y = 51/40
d) y - 6/5 : 2/3 = 5/6
y - 9/5 = 5/6
y = 79/30
e) y : 7/8 + 3/4 = 7/4
y : 7/8 = 1
y = 7/8
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9=135
a) \(x-\frac{5}{3}-\frac{1}{2}=\frac{2}{9}\)
\(x-\frac{5}{3}=\frac{2}{9}+\frac{1}{2}\)
\(x-\frac{5}{3}=\frac{13}{18}\)
\(x=\frac{13}{18}+\frac{5}{3}\)
\(x=\frac{43}{18}\)
b) \(y:\frac{7}{9}=4-\frac{23}{8}\)
\(y:\frac{7}{9}=\frac{9}{8}\)
\(y=\frac{9}{8}\times\frac{7}{9}\)
\(y=\frac{7}{8}\)
ủng hộ nha
a) \(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}\)
\(=1-\frac{1}{4}\)
\(=\frac{3}{4}\)
b) \(\frac{4}{7}\times\frac{8}{9}+\frac{4}{7}\times\frac{1}{9}\)
\(=\frac{4}{7}\times\left(\frac{8}{9}+\frac{1}{9}\right)\)
\(=\frac{4}{7}\times1\)
\(=\frac{4}{7}\)
c) \(\frac{13}{6}\times\frac{3}{8}-\frac{3}{8}\times\frac{7}{6}\)
\(=\frac{3}{8}\times\left(\frac{13}{6}-\frac{7}{6}\right)\)
\(=\frac{3}{8}\times1\)
\(=\frac{3}{8}\)
d) \(\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+...+\frac{1}{9x10}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)
\(=1-\frac{1}{10}\)
\(=\frac{9}{10}\)
Bài làm :
Y = 11 - 10 + 9 - 8 + 7 - 6 + 5 - 4 + 3 - 2 + 1
Y = 1 + 1 + 1 + 1 + 1 + 1( có 6 chữ số = 1 )
=> Y = 1 x 6 = 6
Vậy Y = 6 nha!
1 + 9 + 3 + 7 + 5 + 8 + 4 + 6 + 2 + 1 + 2 + 3 + 4 + 5 + 7 + 8 + 6 + 9 = 90
y+9/16=3/4
y=3/4-9/16
y=3/16