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a)\(\frac{27}{5}\text{x}\frac{91}{12}\text{x}\frac{125}{9}\text{x}\frac{96}{13}=\frac{27}{9}\text{x}\frac{91}{13}\text{x}\frac{125}{5}\text{x}\frac{96}{12}=3\text{x}7\text{x}25\text{x}8\)
Đến đây tự tính nha !
b)\(\frac{2539}{35}\text{x}\frac{7}{90}+\frac{561}{35}\text{x}\frac{7}{90}=\frac{7}{90}\text{x}\left(\frac{2539}{35}+\frac{561}{35}\right)=\frac{7}{90}\text{x}\frac{3100}{35}=\frac{3100}{90}\text{x}\frac{7}{35}=\frac{310}{9}\text{x}\frac{1}{5}=\frac{62}{9}\)

Ta có : 0,36⋅950+0,18⋅726⋅2+3⋅324⋅0,121+3+5+7+9+...+27+29+31−1521+3+5+7+9+...+27+29+31−1520,36⋅950+0,18⋅726⋅2+3⋅324⋅0,12
Đặt A = 0,36 . 950 + 0,18 . 726 . 2 + 3. 324 . 0,12
= 0,36 . 950 + 0,36 . 726 + 0,36 . 324
= 0,36(950 + 726 + 324) = 0,36.2000 = 720
Đặt B = (1 + 3 + 5 + 7 + 9 + ... + 27 + 29 + 31) - 152
Số số hạng : (31 - 1) : 2 + 1 = 16(số)
=> Tổng : (1 + 31).16 : 2 = 256
=> B = 256 - 152 = 104
Vậy ��=720104=9013BA=104720=1390

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) 3 x X x 2/3 = 4/5
3.x=6/5
x=2/5
b) 3,94 x 18,24 + 18,24 x 3,72 + 18,24 x 2,34
=18,24(3,94+3,72+2,34)
=18,24.10
=182,4
d) 8/19 x 2/7 + 8/19 x 1/7 + 8/19 x 4/7
=8/19(2/7+1/7+4/7)
=8/19.1
=8/19

= \(x^8.\frac{1}{10}.\frac{2}{9}.\frac{3}{8}.\frac{4}{7}.\frac{5}{6}.\frac{6}{5}.\frac{7}{4}.\frac{8}{3}.\frac{9}{2}\)
= \(x^8.\frac{1}{10}.\left(\frac{2}{9}.\frac{9}{2}\right).\left(\frac{3}{8}.\frac{8}{3}\right).\left(\frac{4}{7}.\frac{7}{4}\right).\left(\frac{5}{6}.\frac{6}{5}\right)\)
= \(x^8.\frac{1}{10}.1.1.1.1\)
= \(x^8.\frac{1}{10}\)
Mk ko pik co dung ko nua

a)
\(x.\frac{7}{9}=\frac{2}{3}+2\frac{1}{2}\)
\(x.\frac{7}{9}=\frac{19}{6}\)
\(x=\frac{19}{6}:\frac{7}{9}\)
\(x=\frac{57}{14}\)
b) \(\frac{5}{7}+x:\frac{9}{4}=\frac{4}{3}\)
\(x:\frac{9}{4}=\frac{4}{3}-\frac{5}{7}\)
\(x:\frac{9}{4}=\frac{13}{21}\)
\(x=\frac{13}{21}.\frac{9}{4}\)
\(x=\frac{39}{28}\)

Đặt A=1 / 1 x 3 + 2 / 3 x 7 + 1 / 7 x 9 + 3 / 9 x 15 + 6 / 15 x 27
2A=2 / 1 x 3 + 4 / 3 x 7 + 2 / 7 x 9 + 6 / 9 x 15 + 12 / 15 x 27
2A=1-1/3+1/3-1/7+1/7-1/9+1/9-1/15+1/15-1/27
2A=1-1/27
2A=26/27
A=13/27
( 27 - 3 x 9 ) : 9 x 1 x 3 x 5 x 7
=( 27 - 27) : 9 x1 x3 x5 x 7
= 0 : 9 x 1 x 3 x 5 x 7
= 0 x 1 x 3 x 5 x 7
= 0
( 27 - 3 x 9 ) : 9 x 1 x 3 x 5 x 7
( 27 - 27 ) : 9 x 1 x 3 x 5 x 7
= 0 : 9 x 1 x 3 x 5 x 7
=> 0
:33