\(\left(4\frac{46}{65}+x\right).1\frac{1}{12}=5,75\)

\(\Rightarrow\frac{306}{65}+x.\frac{13}{12}=\frac{23}{4}\)

\(\Rightarrow\frac{51}{10}+\frac{13}{12}x=\frac{23}{4}\)

\(\Rightarrow306x=65x=345\)

\(\Rightarrow65x=39\)

\(\Rightarrow x=\frac{3}{5}\)

b, \(\frac{5}{4}-\left(\frac{3}{2}x+0,5\right)=1\frac{1}{4}\)

\(\Rightarrow\frac{5}{4}-\frac{3}{2}x-0,5=\frac{5}{4}\)

\(\Rightarrow\frac{5}{4}-\frac{3}{2}x-\frac{1}{2}=\frac{5}{4}\)

\(\Rightarrow\frac{3}{4}-\frac{3}{2}x=\frac{5}{4}\)

\(\Rightarrow3-6x=5\)

\(\Rightarrow-6x=2\)

\(\Rightarrow x=-\frac{1}{3}\)

Phần b) chị sai nhé ! Dấu [ ] là phần nguyên nâng cao của lớp 6 nhé.

100000

`x:0,5+x:0,125=10,35`

`x xx 2 + x xx 8 = 10,35`

` x xx (2+8) =10,35`

` x xx 10 = 10,35`

` x=10,35:10`

`x=1,035`

Dễ mà

a, \(\left(4\frac{46}{65}+x\right).1\frac{1}{2}=5,75\)

\(\left(4\frac{46}{65}+x\right)=5,75:1\frac{1}{2}\)

\(\left(4\frac{46}{65}.x\right)=4\)

\(x=4:4\frac{46}{65}\)

\(x=\frac{130}{153}\)

b tương tự

a,(\(4\frac{46}{65}\)+ x).\(1\frac{1}{12}\)= 5,75

(\(\frac{306}{65}\)+x).\(\frac{13}{12}\)=5,75

(\(\frac{306}{65}\)+x)          = 5,75 / \(\frac{13}{12}\)

(\(\frac{306}{65}\)+x)          = \(\frac{69}{13}\)

                 x            = \(\frac{69}{13}\)- \(\frac{306}{65}\)

                 x            = \(\frac{3}{5}\)

    4/x=0.5

(=)x= 4/0.5

(=)x=8

     -y/6=0.5

(=)-y=0.5*6

(=)-y=3

(=)y=-3

OK?

 X + X x 2 + X x 4 +X x8 =30

X x ( 1 + 2 +4 + 8 )         =30

X x 15                             = 30

                                X     = 30 : 15

                               X       = 2

\(C=\left(x^3-x^2y+xy^2-y^3\right)\left(x+y\right)=\left(x-y\right)^3\left(x+y\right)=\left(2--0,5\right)^3.\left(2+0,5\right)\)

\(=15,625\times2,5=39,0625\)

a x 102+ a x 2-a x 4= 182

a x( 102+ 2 - 4)       = 182

a x 100                    = 182

 a                             = 182 : 100

 a                              = 91/50

a x 102 + a : 0,5 – a : 0,25 = 182

a x 102 + a x 2 - a x 4 = 182

a x ( 102 + 2 -4) = 182

a x 100 = 182

a = 182 :100

a = 1,82

\(x:0,25+x:0,5+x:0,01=214\)

\(\Rightarrow x:\left(0,25+0,5+0,01\right)=214\)

\(x:0,76=214\)

\(x=162,64\)