Question

Tìm x

a) 219 -7.(x+1)=100

b) \(20+2^3.\left(x+3\right)=5^2.4\)

Answer 1

a, 219 - 7.(x + 1) = 100

              7.(x + 1) = 219 - 100

              7.(x + 1) = 119

                  x + 1  = 119  : 7

                  x + 1  = 17

                  x        = 17 - 1

                  x        = 16

Answer 2

a,  219-7(x+1)=100

7(x+1)=219-100

7(x+1)=119

x+1=119/7

x+1=17

x=17-1

x=16

Vậy x=16

b, 20+2³(x+3)=5².4

20+8(x+3)=100

8(x+3)=100-20

8(x+3)=80

x+3=80/8

x+3=10

x=10-3

x=7

Vậy x=7

Answer 3

a) 219 - 7(x + 1) = 100

=> 7(x + 1) = 119 

=> x + 1 = 17

=> x = 16

Answer 4

a) \(219-7\left(x+1\right)=100\)

\(7\left(x+1\right)=219-100\)

\(7\left(x+1\right)=119\)

\(x+1=17\)

\(x=16\)

b) \(20+2^3\left(x+3\right)=5^2\cdot4\)

\(20+8\left(x+3\right)=25\cdot4\)

\(20+8\left(x+3\right)=100\)

\(8\left(x+3\right)=80\)

\(x+3=10\)

\(x=7\)

Answer 5

\(7.\left(x+1\right)=219-100\)

\(7.\left(x+1\right)=119\)

\(x+1=199:7\)

\(x+1=\frac{199}{7}\)

\(x=\frac{199}{7}-1=\frac{192}{7}\)

Answer 6

a) Ta có \(219-7.\left(x+1\right)=100\)

\(\Rightarrow7.\left(x+1\right)=219-100\)

\(\Rightarrow7.\left(x+1\right)=119\)

\(\Rightarrow x+1=17\)

\(\Rightarrow x=16\)

b,Ta có \(20+2^3.\left(x+3\right)=5^2.4\)

\(\Rightarrow20+8.\left(x+3\right)=25.4\)

\(\Rightarrow20+8.\left(x+3\right)=100\)

\(\Rightarrow8.\left(x+3\right)=80\)

\(\Rightarrow x+3=10\)

\(\Rightarrow x=7\)

Answer 7

a) 219 - 7(x+1) = 100

219 - (7x+7) = 100 =) 7x+7 = 219 - 100 =) 7x+7 = 119 =) 7x = 119 - 7 =) 7x = 112 =) x = 112 ; 7 =) x = 16

b) 20 + 2³ ( x + 3 ) = 5² . 4 =) 20 + 8 ( x + 3 ) = 25 . 4 =) 20 + (8x + 24) = 100 =) 8x + 24 = 100 - 20 =) 8x + 24= 80 =) 8x = 80 - 24 

=) 8x = 56 =) x = 56 : 8 =) x = 7

Answer 8

\(219-7.\left(x+1\right)=100\)

\(219-7x-7=100\)

\(212-7x=100\)

\(7x=212-100\)

\(7x=112\)

\(x=\frac{112}{7}=16\)

Vậy \(x=16\)

\(20+2^3.\left(x+3\right)=5^2.4\)

\(20+8x+24=25.4\)

\(8x=100-44\)

\(8x=56\)

\(x=\frac{56}{7}=7\)

Vậy \(x=7\)

Tham khảo nhé~

Answer 9

b, 20 + 2³. ( x + 3) = 5². 4

    20  +  8.(x + 3)   = 25 . 4

   20   + 8 . ( x + 3) = 100

              8 .(x + 3)  = 100 - 20

              8. (x + 3)  = 80

                   x + 3   = 80 : 8

                   x + 3   = 10

                   x =   10 - 3

                   x = 7

Answer 10

a) 219-7.(x+1)=100

=> 219-100    = 7.(x+1)

=> 7(x+1)      = 119

=>   x+1        =119:7

=>   x+1        = 17

=>   x            = 17-1

=>   x            =  16

b)20+2³(x+3)=5².4

=> 20+8(x+3) = 25.4

=>20+8(x+3)  =100

=>     8(x+3)   =100-20

=>    8(x+3)    = 80

=>      x+3      =80:8

=>      x+3      =10

=>      x          =10-3

=>      x          = 7

Answer 11

a) x =16

b) x= 7 

Answer 12

a)7.(x+1)=219-100

7.(x+1)=119

x+1=119:7

x+1=17

x    =17-1

x    =16

b)20+8.(x+3)=25.4

20+8.(x+3)=100

8.(x+3)=100-20

8.(x+3)=80

x+3     =80:8

x+3    =10

x        =10-3

x       =   7

EZ mà hi hi