\(\left(2x+13\right):5=17\)

\(\Rightarrow2x+13=17.5\)

\(\Rightarrow2x+13=85\)

\(\Rightarrow2x=85-13\)

\(\Rightarrow2x=72\Rightarrow x=\frac{72}{2}=36\)

\(360:\left(11x-7\right)=90\)

\(11x-7=\frac{360}{90}\)

\(\Rightarrow11x-7=4\)

\(\Rightarrow11x=4+7=11\)

\(\Rightarrow x=\frac{11}{11}=1\)

\(30:\left(3x-7\right)=15\)

\(\Rightarrow3x-7=\frac{30}{15}=2\)

\(\Rightarrow3x=2+7=9\)

\(\Rightarrow x=\frac{9}{3}=3\)

a,\(\left(2x+13\right):5=17\)

\(2x+13=17.5\)

\(2x=72\)

\(x=72:2\)

\(x=36\)

b,\(360:\left(11x-7\right)=90\)

\(11x-7=4\)

\(11x=11\)

\(x=1\)

c,\(30:\left(3x-7\right)=15\)

\(3x-7=2\)

\(3x=9\)

\(x=3\)

(2x + 13): 5 =17

2x + 13=85

2x=72

x=36

360 :(11x -7)=90

11x - 7=4

11x=11

x=1

30 : (3x - 7)=15

3x-7=2

3x=9

x=3

360:(x-7)=90

(x-7)=360:90

(x-7)=4

x=4+7

x=11

360 : (x-7 ) = 90

( x - 7 )       =  360 : 90

x  - 7                 =  4

          x            =  4 + 7

           x              = 11

y + 60 = 360 + 90

y + 60 = 450

y        = 450 - 60

y        = 390

y - 60 = 360 - 90

y - 60 = 270

y       = 270 + 60

y       = 330

y + 60 = 360 + 90

y + 60 = 450

        y = 450 - 60

        y = 390

y - 60 = 360 - 90

y - 60 = 270

      y = 270 + 60

      y = 330

y+60=360+90

y+60=450

     y =450-60

     y =390.

y-60=360-90

y-60=270

    y =270+60

    y =330.

x=360:30

x=12

x x 30 = 360

       x = 360 : 30

       x = 12

   Tích nha!

 x x 30 =360

      x = 360 :30

      x = 12 ai tk mk mk tk lai

360/X + 180/X + 5 = 30/60
=> 2.180/X + 180/X + 5 = 1/2
=> 3.180/X = 1/2 -5 =-9/2
=> 540/X = -9/2
=> X = -540.2/9
=> X = -120

a) 15 + x + 27 + 53 = 201

=> x + ( 15 + 27 + 53 ) = 201

=> x + 95 = 201

=> x = 201 - 95

=> x = 106

Vậy x = 106

b) 50 * x + 20 617 = 80 617

=> 50 * x = 80 617 - 20 617

=> 50 * x = 60 000

=> x = 60 000 : 50

=> x = 1 200

Vậy x = 1 200

c) x * 25 + x * 35 = 90 * 360

=> x * ( 25 + 35 ) = 32 400

=> x * 60 = 32 400

=> x = 32 400 : 60

=> x = 540

Vậy x = 540

a: Sửa đề: sin x=4/5

cosx=-3/5; tan x=-4/3; cot x=-3/4

b: 270 độ<x<360 độ

=>cosx>0

=>cosx=1/2

tan x=căn 3; cot x=1/căn 3

Ta có:

23875−360×40=23875−14400=9475

1234+258×30=1234+7740=8974

Mà: 9475>8974

Vậy: 23875−360×40>1234+258×30.

Đáp án C