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\(y:\frac{1}{4}+y:\frac{1}{8}-y:\frac{1}{2}=10\)
\(\Leftrightarrow y.4+y.8-y.2=10\)
\(\Leftrightarrow y.\left(8+4-2\right)=10\)
\(\Leftrightarrow10y=10\)
\(\Leftrightarrow y=10:10=1\)
Vậy y=1
Chúc bạn học tốt
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!
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
\(\frac{1,3}{4}\times8-y=1\frac{2}{5}\)
\(\frac{13}{40}\times8-y=\frac{7}{5}\)
\(\frac{13}{5}-y=\frac{7}{5}\)
\(y=\frac{13}{5}-\frac{7}{5}\)
\(y=\frac{6}{5}\)
b) \(\frac{2,3}{4}\div\frac{2}{4}+y=\frac{19}{15}\)
\(\frac{23}{40}\times2+y=\frac{19}{15}\)
\(\frac{23}{20}+y=\frac{19}{15}\)
\(y=\frac{19}{15}-\frac{23}{20}\)
\(y=\frac{7}{60}\)
1
a )
( 9407 - 7274 ) : y = 8058 : 34
2133 : y = 237
y = 2133 : 237
y = 9
b )
y x 128 - y x 17 - y x 11 = 576000
y x ( 128 - 17 - 11 ) = 576000
y x 100 = 576000
y = 576000 : 100
y = 5760
2
a )
( 125 x 36 ) : ( 5 x 9 ) =
4500 : 45 =
100
b )
1/10 + 2/10 + 3/10 + 4/10 + 5/10 + 6/10 + 7/10 + 8/10 + 9/10=
( 1/10 + 9/10 ) + ( 2/10 + 8/10 ) + ( 3/10 + 7/10 ) + ( 4/10 + 6/ 10 ) + 5/10=
1 + 1 + 1 + 1 + 0,5 =
4,
Chúc bạn học giỏi nhé !
Bài 1 :
\(\frac{2}{19}+\frac{4}{5}+1\frac{7}{9}+\frac{1}{5}\)
\(=\frac{2}{19}+1\frac{7}{9}+\left(\frac{4}{5}+\frac{1}{5}\right)\)
\(=\frac{2}{19}+1\frac{7}{9}+1\)
\(=\frac{493}{171}\)
\(\frac{1}{11}+\frac{2}{11}+\frac{3}{11}+\frac{4}{11}+\frac{5}{11}+\frac{6}{11}+\frac{7}{11}+\frac{8}{11}+\frac{9}{11}+\frac{10}{11}\)
\(=\left(\frac{1}{11}+\frac{10}{11}\right)+\left(\frac{2}{11}+\frac{9}{11}\right)+\left(\frac{3}{11}+\frac{8}{11}\right)+\left(\frac{4}{11}+\frac{7}{11}\right)+\left(\frac{5}{11}+\frac{6}{11}\right)\)
\(=1+1+1+1+1\)
\(=5\)
Bài 2 :
y : (23 + 27) = 9 1000 : (y x 25) = 8
y : 50 = 9 y x 25 = 1000 : 8
y = 9 x 50 y x 25 = 125
y = 450 y = 125 : 25
133 : (190 : y) = 7 y = 5
190 : y = 133 : 7 450 : (y + 42) = 9
190 : y = 19 y + 42 = 450 : 9
y = 190 : 19 y + 42 = 50
y = 10 y = 50 - 42
y = 8
Ta có : \(y:\frac{1}{4}+y:\frac{1}{8}-y:\frac{1}{2}=10\)
=> y x 4 + y x 8 - y x 2 = 10
=> y x (4 + 8 - 2) = 10
=> y x 10 = 10
=> y = 1
Vậy y = 1
\(y\div\frac{1}{4}+y\div\frac{1}{8}-y\div\frac{1}{2}=10\)
\(y\times4+y\times8-y\times2=10\)
\(4y+8y-2y=10\)
\(10y=10\)
\(y=10\)