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a) \(x+\frac{1}{5}-\frac{2}{7}=4\frac{1}{2}\)
=> \(x+\frac{1}{5}-\frac{2}{7}=\frac{9}{2}\)
=> \(x=\frac{9}{2}+\frac{2}{7}-\frac{1}{5}=\frac{321}{70}\)
b) \(1\frac{3}{4}+x-\frac{7}{8}=5\)
=> \(\frac{7}{4}+x-\frac{7}{8}=5\)
=> \(\frac{7}{4}+x=\frac{47}{8}\)
=> \(x=\frac{33}{8}\)
c) \(\frac{1}{2}-\frac{1}{3}\cdot x=\frac{3}{4}\)
=> \(\frac{1}{3}\cdot x=\frac{1}{2}-\frac{3}{4}=-\frac{1}{4}\)
=> \(x=\left(-\frac{1}{4}\right):\frac{1}{3}=\left(-\frac{1}{4}\right)\cdot3=-\frac{3}{4}\)
\(\frac{2}{3}.\frac{4}{5}+\frac{1}{3}.\frac{4}{5}=\frac{4}{5}\left(\frac{2}{3}+\frac{1}{3}\right)=\frac{4}{5}.\frac{3}{3}=\frac{4}{5}.1=\frac{4}{5}\)
\(\frac{1}{2}:\frac{3}{4}+\frac{1}{6}:\frac{3}{4}=\frac{3}{4}:\left(\frac{1}{2}+\frac{1}{6}\right)=\frac{3}{4}:\frac{2}{3}=\frac{9}{8}\)
\(\frac{2}{3}.\frac{4}{5}-\frac{1}{3}.\frac{4}{5}=\frac{4}{5}\left(\frac{2}{3}-\frac{1}{3}\right)=\frac{4}{5}.\frac{1}{3}=\frac{4}{15}\)
\(\frac{1}{2}:\frac{3}{4}-\frac{1}{6}:\frac{3}{4}=\frac{3}{4}:\left(\frac{1}{2}-\frac{1}{6}\right)=\frac{3}{4}:\frac{1}{3}=\frac{9}{4}\)
\(\frac{2}{3}.\frac{4}{5}+\frac{1}{3}.\frac{4}{5}=\left(\frac{2}{3}+\frac{1}{3}\right).\frac{4}{5}=1.\frac{4}{5}=\frac{4}{5}\)
\(\frac{1}{2}:\frac{3}{4}+\frac{1}{6}:\frac{3}{4}=\frac{1}{2}.\frac{4}{3}+\frac{1}{6}.\frac{4}{3}=\left(\frac{1}{2}+\frac{1}{6}\right).\frac{4}{3}=\frac{2}{3}.\frac{4}{3}=\frac{8}{9}\)
c,d tương tự
a)\(\frac{5}{6}+\frac{3}{4}x=3\Leftrightarrow\frac{3}{4}x=\frac{13}{6}\Leftrightarrow x=\frac{26}{9}\)
b)\(\frac{8}{x}\cdot\frac{3}{4}=\frac{9}{10}\Leftrightarrow\frac{8}{x}=\frac{6}{5}\Leftrightarrow x=\frac{8\cdot5}{6}=\frac{20}{3}\)
c)\(3\cdot\left(x+\frac{1}{2}\right)-\frac{1}{3}=\frac{2}{5}\Leftrightarrow3\left(x+\frac{1}{2}\right)=\frac{11}{15}\Leftrightarrow x+\frac{1}{2}=\frac{11}{45}\Leftrightarrow x=-\frac{23}{90}\)
d)\(\frac{1}{4}+\frac{x}{3}=\frac{5}{6}\Leftrightarrow\frac{x}{3}=\frac{7}{12}\Leftrightarrow x=\frac{7\cdot3}{12}=\frac{7}{4}\)
Bạn ơi , cái dấu hai chiều là sao ? trả lời nhanh cho mình nhé !
BÀi này cậu vận dụng kiến thức về phân số ở Tiểu học
tk mình nhé
Nếu giải ra thì tốn sức lắm
(4/5:6/5:1/y)x30-26=54
=> ( 2/3.y)x30 = 54+26
=> ( 2/3.y)x30=80
=> 2/3.y=80:30
=>2/3.y=8/3
=> y=8/3:2/3
=> y=4
vậy y =4
****
\(3\frac{1}{2}x4\frac{3}{4}=\frac{7}{2}x\frac{19}{4}=\frac{133}{8}\)
\(2\frac{1}{6}:2\frac{5}{6}=\frac{13}{6}x\frac{6}{7}=\frac{78}{102}=\frac{13}{17}\)
\(3\frac{1}{2}×4\frac{3}{4}=\frac{7}{2}×\frac{19}{4}=\frac{133}{8}\)
\(2\frac{1}{6}:2\frac{5}{6}=\frac{13}{6}:\frac{17}{6}=\frac{13}{17}\)
2 * x + 14 * (34-9) = 900
2 * x + 14 * 25 = 900
2 * x + 350 = 900
2 * x = 550
x = 550 : 2
x = 275
97 - x =486 : 27
97 - x = 18
x= 97 - 18
x = 79
9 * x - 4 * x = 24 * 5
9 * x - 4 * x = 120
( 9 - 4 ) * x = 120
5 * x =120
x= 120 :5
x =24
dài v ~
4/3 * (7/2 - 5/4 ) - 3/4 * x =2
4/3 * 9/4 - 3/4 * x = 2
3 - 3/4 * x = 2
9/4 * x =2
x = 2 : 9/4
x = 8/9
~~~~~~~~~~
5/3 * x - 3/4 * x + 4/3 = 11/6
( 5/3- 3/4 ) * x + 4/3 =11/6
11/12 * x + 4/3 = 11/6
11/12 * x = 11/6 - 4/3
11/12 * x = 1/2
x= 1/2 : 11/12
x=6/11
dài quá mức bấm mãi ~
Tìm x:
a)
2 * x + 14* ( 34 - 9 ) = 900
2* x + 14 * 25 = 900
2*x + 350 = 900
2*x = 900 - 350
2*x = 550
x = 550 : 2
x = 275
b)
97 - x = 486: 27
97 - x = 18
x = 97 - 18
x = 79
c) 9 * x - 4 * x = 24 * 5
x - ( 9* 4 ) = 120
x - 36 = 120
x = 120 + 36
x = 156
Ủng hộ nha! ^.^
a, 2*x+14*( 34-9 ) = 900 b, 97 - x = 486 : 27 c, 9*x - 4*x = 24*5
2*x+2*7*25 = 900 97 - x = 18 ( 9 - 4 ) *x = 24*5
2*x+2*175 = 900 x = 97 - 18 5*x = 24*5
2* ( x + 175 ) = 900 x = 79 x = 24
x + 175 = 900 :2 = 450
x = 450 - 175 = 275
d, 3/4 * x - 1/2 = 1/4 : 3/4 e, 4/3 * ( 7/2 -5/4 ) - 3/4 * x =2 g, 5/3*x - 3/4*x + 4/3 = 11/6
3/4 * x -1/2 = 1/3 4/3* 9/4-3/4*x = 2 ( 5/3-3/4) * x = 11/6 - 4/3 =1/2
3/4 * x = 1/3 + 1/2 = 5/6 3-3/4*x=2 11/12*x=1/2
x = 5/6 : 3/4 3/4*x =3-2 =1 x =1/2 : 11/12
x = 10/9 x= 1 : 3/4 = 4/3 x = 6/11