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1/5+8/15:y=1/2
8/15:y=1/5-1/2
8/15:y=-3/10
y=8/15:1/2
y=16/15
vậy y=16/15
4/11.y-6/11=2/5
4/11.y=2/5+6/11
4/11.y=52/55
y=52/55:4/11
y=13/5
vậy y=13/5
a } 4 / 5 x 3 /y x 2 / 11 = 24 / 165
= 4/5 x 2/11 x 3/y =24/125
=8/55 x 3/y=24/125
= 24/125:8/55
=33/25
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
a)C1:=2/7:2/5
=5/7
C2:=6/7:2/5-4/7:2/5
=15/7-10/7
=5/7
b)C1:=88/30+77/30
=11/2
C2:=(8/15+7/15):2/11
=1:2/11
=11/2
a,Cách 1: (6/11 + 5/11 ) x 3/7 Cách 2 :(6/11 + 5/11) x 3/7
= 1 x 3/7 =6/11 x 3/7 + 5/11 x 3/7
= 3/7 = 18/77 + 15/77
= 3/7
b, Cách 1:3/5 x 7/9 - 3/5 x 2/9 Cách 2 :3/5 x 7/9 - 3/5 x 2/9
= 7/15 - 2/15 = 3/5 x (7/9 - 2/9 )
= 1/3 = 3/5 x 5/9
= 1/3
c, Cách 1:(6/7 - 4/7) : 2/5 Cách 2: ( 6/7- 4/7 ) : 2/5
= 2/7 : 2/5 = 6/7 : 2/5 - 4/7 : 2/5
= 5/7 = 15/7 - 10/7
= 5/7
d,Cách 1:8/15 : 2/11 + 7/15 : 2/11 Cách 2:8/15 : 2/11 +7/15 : 2/11
= 88/30 + 77/30 =(8/15+7/15) :2/11
= 11/2 = 1 : 2/11
= 11/2
Bài 2 cậu tự làm nhé !
5/7 : 2/3 = 5/7 x 3/2 = 15/14
9/11 : 8 /13 = 9/11 x 13/8 = 117/88
1/8 : 1/6 = 1/8 x 6 = 3/4
4/15 : 7/30 = 4/15 x 30/7 = 8/7
\(\frac{5}{7}:\frac{2}{3}=1\frac{1}{14}\) \(\frac{9}{11}:\frac{8}{13}=1\frac{29}{88}\)
\(\frac{1}{8}:\frac{1}{6}=\frac{3}{4}\) \(\frac{4}{15}:\frac{7}{30}=1\frac{1}{7}\)\(k\)\(nha\)\(!!!!!!!!!!!!!!\)
a) 1/5 + 8/15 : y = 1/2
8/15 : y = 1/2 - 1/5
8/15 : y = 3/10
y = 8/15 : 3/10
y = 16/9
b) 4/11 x y -6/11 = 2/5
4/11 x y = 2/5 + 6/11
4/11 x y = 52/55
y = 52/55 : 4/11
y = 13/5
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