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a, 37/9 - Y = 6/5 x 15/16
37/9 - Y = 9/8
Y = 37/9 - 9/8
Y = 296/72 - 81/72
Y = 215/72
b, Y x 3/15 = 4/5 - 2/3
Y x 3/15 = 2/15
Y = 2/15 : 3/15
Y = 2/15 x 15/3
Y = 2/3
x + 21/40 = 53/40
x = 53/40 - 21/40
x = 32/40 = 4/5
34/35 : x = 17/5
x = 34/35 : 17/5
x = 2/7
`x + 3 / 4 xx 7 / 10 = 53 / 40`
`x + 21 / 40 = 53 / 40`
`x = 53 / 40 - 21 / 40`
`x = 32 / 40`
`x = 4 / 5`
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`( 2 / 5 + 4 / 7 ) : x = 17 / 5`
`( 14 / 35 + 20 / 35 ) : x = 17 / 5`
`34 / 35 : x = 17 / 5`
`x = 34 / 35 : 17 / 5`
`x = 34 / 35 xx 5 / 17`
`x = 2 / 7`
1035 + 207 x 4 x 28 - 69 x 3 x 17
1035 + 207 x 112 - 207 x 17
1035 + 207 x(112-17)
207 x 5 + 207 x 95
207 x (5+95)
\(\dfrac{4}{5}\times\dfrac{5}{8}=\dfrac{20}{40}=\dfrac{1}{2}\)
\(\dfrac{7}{15}+\dfrac{4}{5}=\dfrac{7}{15}+\dfrac{12}{15}=\dfrac{19}{15}\)
\(\dfrac{2}{3}-\dfrac{3}{8}=\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
\(\dfrac{1}{2}\div\dfrac{2}{5}=\dfrac{1}{2}\times\dfrac{5}{2}=\dfrac{5}{4}\)
1)5/7+7/9-2/3
=45/63+49/63-42/63
52/63
2)5/6 nhân 4/5 -17/30
=2/3-17/30
= 20/30-17/30
=3/10=1/10
3) 8/9:2/5-25/36
=8/9 nhân 5/2 -25/36
=20/9-25/36
=80/36-25/36
=55/36
x + 3/4 x 7/10 = 53/40
x + 21/40 = 53/40
x = 53/40 - 21/40
x = 32/40
x = 4/5
34/35 : x = 17/5
x = 34/35 : 17/5
x = 34/35 x 5/17
x = 2/7
x + 3/4 x 7/10 = 53/40
x + ( 3/4 x 7/10 ) = 53/40
x + 21/40 = 53/40 ( tới đây bn cứ lm như bth )
x = 53/40 - 21/40
x = 4/5
34/35 : x = 17/5
x = 34/35 : 17/5
x = 2/7