a+a+a+\(\frac{5}{4}\)x\(\frac{9}{2}\)+\(\frac{1}{2}\)+a=136

a+a+a+\(\frac{45}{8}\)+\(\frac{4}{8}\)+a=136

4a+\(\frac{49}{8}\)=136

4a=136-\(\frac{49}{8}\)

4a=\(\frac{1088}{8}\)-\(\frac{49}{8}\)

4a=\(\frac{1039}{8}\)

a=\(\frac{1039}{8}\):4

a=\(\frac{1039}{8}\)x\(\frac{1}{4}\)

a=\(\frac{1039}{32}\)

vậy a=\(\frac{1039}{32}\)

hà hà hà bạn nói thật là nực cười dễ lắm tự giải đi

Đáp án :C

là C.10

la c nha

`Answer:`

`x+9/4 = 1/3-2/4 - (-1/5)- (-2/3) -(-3/4)+4/5`

`<=>x+9/4=1/3-2/4+1/5+2/3+3/4+4/5`

`<=>x=1/3-1/2+1/5+2/3+3/4+4/5-9/4`

`<=>x=(1/2+2/3)+(3/4-9/4)+(1/5+4/5)-1/2`

`<=>1-3/2+1-1/2`

`<=>2-2=0`

Vậy `x=0`

x = 0

số các số hạng là : 

( 111 - 0 ) : 1 + 1 = 112

tổng dãy trên là :

( 111 + 0 ) x 112 : 2 = 6216

                    đs: 6216

Số các số hạng là:

(111-1):1+1=111 (số)

Tổng là:

(111+1)x111:2=6216

Đáp số:6216

2 : \(buổi \) \(sáng\) \(bán\) \(dc :\)

\((360 - 142 : 2 =109 l\)

\(buổi\) \(chiều\) \(bán\) \(dc :\)

\(360 - 109 = 251 l\)

\(1,\)

\(a,x\times\dfrac{3}{9}=\dfrac{9}{15}\)            \(b,x:\dfrac{1}{2}=\dfrac{5}{6}\)

\(x=\dfrac{9}{15}:\dfrac{3}{9}\)                    \(x=\dfrac{6}{5}\times\dfrac{1}{2}\)

\(x=\dfrac{81}{45}=\dfrac{9}{5}\)                  \(x=\dfrac{6}{10}=\dfrac{3}{5}\)

\(2,\) có bạn làm rồi nhé ;>

\(3,\)

\(a,\dfrac{7}{12}+\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{7}{12}+\left(\dfrac{3}{4}\times\dfrac{2}{9}\right)=\dfrac{7}{12}+\dfrac{1}{6}=\dfrac{7}{12}+\dfrac{2}{12}=\dfrac{7+2}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)

\(b,\dfrac{8}{9}-\dfrac{4}{15}:\dfrac{2}{5}=\dfrac{8}{9}-\left(\dfrac{4}{15}:\dfrac{2}{5}\right)=\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{8}{9}-\dfrac{6}{9}=\dfrac{8-6}{9}=\dfrac{2}{9}\)

a.x=9/15:3/9

x=9/5

b.x=5/6x1/2

x=5/12

2.ngày đầu bán được số dầu là:

360x2/5=144(l)

cửa hàng còn lại số dầu là:

360-144=216(l)

3.a.7/12+3/4x2/9

=7/12+1/6

=7/12+2/12

=9/12=3/4

bằng 0 nhé
tk mk nha

A = (6.6.6.6.6.6.6.6 - 1679616).(9.8.7.6.5.4.3.2.1)

A = (6⁸ - 2⁸.3⁸).9!

A = [6⁸ - (2.3)⁸].9!

A = [6⁸ - 6⁸].9!

A = 0.9!

A = 0

a) \(\dfrac{5}{7}\times\dfrac{5}{9}+\dfrac{4}{9}\times\dfrac{5}{7}\)

\(=\dfrac{5}{7}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)\)

\(=\dfrac{5}{7}\times1\)

\(=\dfrac{5}{7}\)

b) \(\dfrac{1}{10}+\dfrac{5}{9}+\dfrac{4}{9}+\dfrac{9}{10}-1\)

\(=\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\left(\dfrac{1}{10}+\dfrac{9}{10}-1\right)\)

\(=1+0\)

\(=1\)

c) \(\dfrac{5}{7}\times\dfrac{5}{9}+\dfrac{4}{9}\times\dfrac{5}{7}+\dfrac{2}{7}\)

\(=\dfrac{5}{7}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\dfrac{2}{7}\)

\(=\dfrac{5}{7}+\dfrac{2}{7}\)

\(=1\)

d) \(\dfrac{2}{7}+\dfrac{2}{8}+\dfrac{1}{4}+\dfrac{1}{7}+\dfrac{4}{7}\)

\(=\left(\dfrac{2}{8}+\dfrac{1}{4}\right)+\left(\dfrac{2}{7}+\dfrac{1}{7}+\dfrac{4}{7}\right)\)

\(=\left(\dfrac{1}{4}+\dfrac{1}{4}\right)+1\)

\(=\dfrac{1}{2}+1\)

\(=\dfrac{3}{2}\)

e) \(\dfrac{4}{5}+\dfrac{3}{10}+\dfrac{2}{10}+0,7\)

\(=\dfrac{4}{5}+\dfrac{5}{10}+\dfrac{7}{10}\)

\(=\dfrac{4}{5}+\dfrac{12}{10}\)

\(=\dfrac{4}{5}+\dfrac{6}{5}\)

\(=\dfrac{10}{5}\)

\(=2\)

g) \(362\times728+326\times272\)

\(=326\times\left(728+272\right)\)

\(=326\times1000\)

\(=326000\) 

1/4 + 15/16 : 3/8 x 2/3 = 1/4 + 15/16 x 8/3 x2/3 =  1/4 + 5/2 x 2/3 = 1/4 + 15/4 = 16/4 = 4

1 + 2/3 + 2/9 + 2/27 = 27/27 + 18/27 + 6/27 + 2/27 = 53/27 

1/3*x+2/5*(x-1)=4

1/3*x+2/5*x-2/5=4

1/3*x+2/5*x=4+2/5

(1/3+2/5)*x=4 2/5

11/15*x=22/5

         x=22/5/11/15

         x=22/5*11/15

         x=242/75

ủa vậy ư

1/3•x+2/5•x+2/5=4 =(1/3•2/5)•x=(4+2/5)=11/2