x + 630 = 1000 + 120

x + 630 = 1120

x          = 1120 - 630

x          = 490

x + 630 = 1000 + 120

x + 630 = 1120

x           = 1120 - 630

x           = 490

x+630=1120

     x   =1120-630

     x   =490

chuc cau hoc gioi va thanh cong

nhớ tk cho mình đó

x+630=589-120

x+630=469

x=469-630

x=-239

NHé bạn

** mk nha

x+630=469

x=469-630

x=-584

x + 630 = 589 - 120

x + 630 =    469

x          = 469  -  630

x          =     -161

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=10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

ko đăng linh tinh những câu hỏi ko liên quan đến : 

toán ,

tiếng việt ,

tiếng anh

hoặc có thể là đố vui cũng có thể chấp nhận 

lần sau rút kinh nghiệm ko đăng linh tinh bạn nhé ! 

5:25=0,2

30:90=0,3333...

700:630=1,1111...

5÷25=0,2

30÷90=0,333333...

700÷630=1,11111...

5:25=0,2

30:90=0,333333....

700:630=1,111111.....

a) 72.5–(2x+1)=630:972.5–(2x+1)=630:9

⇒245–2x–1=70⇒245–2x–1=70

⇒−2x=−22+70⇒−2x=−22+70

⇒−2x=−174⇒−2x=−174

⇒x=87⇒x=87

b)(10−4x)+120:23=17

10−4x+15=17

10−4x=17−15

10−4x=2

4x=10−2

4x=8

x=8:4

x=2

 

7² x 5-(2x+1)=630:9

<=> 49 x 5-2x-1=70

<=> 245-2x-1=70

<=> -2x+244=70

<=> -2x=-174

<=> x=87

tìm x biết:

a, 7².5-(2x+1)=630:9     

    49.5-(2x+1)=70

    245-(2x+1)=70

    2x+1=245-70

    2x+1=175

    2x=175-1

    2x=174

      x=174:2

      x=87

Vậy x=87

b,  (10-4x)+120:2³=17    

     (10-4x)+120:8=17

     (10-4x)+15=17

       10-4x=17-15

       10-4x=2

            4x=10-2

            4x=8

              x=8:4

              x=2

Vậy x=2

a, 7².5-(2x+1)=630:9

 \(\Leftrightarrow\)   49.5-(2x+1)=70

  \(\Leftrightarrow\)   245 - (2x+1) = 70

     \(\Leftrightarrow\)          2x + 1 = 245 - 70

      \(\Leftrightarrow\)        2x + 1  = 175

   \(\Leftrightarrow\)          2x         = 175 - 1

      \(\Leftrightarrow\)      2x          = 174

        \(\Leftrightarrow\)     x           = 174 : 2

      \(\Leftrightarrow\)       x           = 87.

Vậy x = 87.

b,  (10-4x)+120:2³=17   

 \(\Leftrightarrow\)     (10-4x)+120:8 = 17

    \(\Leftrightarrow\)  (10-4x)+15       = 17

\(\Leftrightarrow\)       10 - 4x             = 17 - 15

  \(\Leftrightarrow\)     10 - 4x              = 2

   \(\Leftrightarrow\)           4x              = 10 - 2

      \(\Leftrightarrow\)       4x               = 8

    \(\Leftrightarrow\)          x                = 8 : 4

  \(\Leftrightarrow\)           x                 = 2

Vậy x = 2.

# HOK TỐT #

120 + 230 + 430 + 630 = 350 + 430 + 630

                                   = 780 + 630 = 1410

230 + 450 + 460 + 123 = 680 + 460 + 123

                                  = 1140 + 123 = 1263

120 + 230 + 430 + 430 = 1410

230 + 450 + 460 + 123 = 1263

k mk , mk k lại

\(120+230+430+630\)

\(=330+430+630\)

\(=760+630\)

\(=1390\)

\(230+450+460+123\)

\(=680+460+123\)

\(=1140+123\)

\(=\)\(1140\)

a,<=> 145-2x-1=70

<=> 2x=74

<=> x=37

b, <=> 10-4x+15=17

<=> 4x=8

<=> x=2

\(7^2\cdot5-\left(2x+1\right)=630\div9\)

\(49\cdot5-\left(2x+1\right)=70\)

     \(245-\left(2x+1\right)=70\)

                     \(2x+1=245-70\)

                      \(2x+1=175\)

                        \(2x=175-1\)

                         \(2x=174\)

                            \(x=174\div2\)

                             \(x=87\)

\(\left(10-4x\right)+120\div2^3=17\)

  \(\left(10-4x\right)+120\div8=17\)

\(\left(10-4x\right)+15=17\)

    \(10-4x=17-15\)

      \(10-4x=2\)

                 \(4x=10-2\)

                  \(4x=8\)

                      \(x=8\div4\)

                      \(x=2\)

a) 72,5 - (2x + 1) = 630 : 9

⇒ 72,5 - (2x + 1) = 70

⇒ 2x + 1 = 2,5

⇒ 2x = 1,5

⇒ x = 0,75

b) (10 - 4x) + 120 : 2³ = 17

⇒ (10 - 4x) + 120 : 8 = 17

⇒ (10 - 4x) + 15 = 17

⇒ 10 - 4x = 2

⇒ 4x = 8

⇒ x = 2

Vậy x = 2

c) [124 - (20 - 4x)] : 30 + 7 = 11

⇒ [124 - (20 - 4x)] : 30 = 4

⇒ 124 - (20 - 4x) = 120

⇒ 20 - 4x = 4

⇒ 4x = 16

⇒ x = 4

Vậy x = 4