1) (x - 35) - 120 = 0

x - 35 = 120

x = 120 + 35

x = 155

2) 310 - (118 - x) = 217

118 - x = 310 - 217

118 - x = 93

x = 118 - 93

x = 25

3) 156 - (x + 61) = 82

x + 61 = 156 - 82

x + 61 = 74

x = 74 - 61

x = 13

4) 814 - (x - 305) = 712

x - 305 = 814 - 712

x - 305 = 102

x = 102 + 305 = 407

5) 100 - 7 - (x - 5) = 58

x - 5 = 93 - 58

x - 5 = 35

x = 35 + 5 = 40

6) 12(x - 1) : 3 = 4³ + 2³

4(x - 1) = 72

x - 1 = 18

x = 18 + 1 = 19

7) 24 + 5x = 7⁵ : 7³

24 + 5x = 49

5x = 25

x = 25 : 5 = 5

8) 5(x - 1) : 3 = 4³ + 2³

\(\dfrac{5}{3}\left(x-1\right)=72\)

x - 1 = \(\dfrac{216}{5}\)

x = 221/5

9) 5(x - 4)² - 7 = 13

5(x - 4)² = 20

(x - 4)² = 4

\(\Rightarrow\left[{}\begin{matrix}x-4=2\\x-4=-2\end{matrix}\right.\)   \(\Rightarrow\left[{}\begin{matrix}x=6\\x=2\end{matrix}\right.\)

10) (x + 1) + (x + 2) + ... + (x + 30) = 795

=> (x + x + x + ... + x) + (1 + 2 + 3 +...+ 30) = 795 (1)

Đặt A = 1 + 2 + 3 +...+ 30

Số số hạng trong A là: (30 - 1) : 1 + 1 = 30 (số)

Tổng A bằng : (30 + 1).30 : 2 =465

Thay A = 465 vào (1) , ta được:

30x + 465 = 795

=> 30x =330

=> x =11

1: =>x-35=120

=>x=120+35=155

2: =>118-x=310-217=93

=>x=118-93=25

3: =>x+61=156-82=74

=>x=74-61=13

4: =>x-305=814-712=102

=>x=102+305=407

5: =>93-(x-5)=58

=>x-5=35

=>x=40

6: =>4(x-1)=64+8=72

=>x-1=18

=>x=19

7: =>5x+24=49

=>5x=25

=>x=5

8: =>5(x-1):3=4^3+2^3=64+8=72

=>5(x-1)=216

=>x-1=216/5

=>x=221/5

B1:

A.1+1=2

B.6+2+5=13

C.6+4+6+2+7=25

D.6+4+7+8=25

B2:

A.x+2=3

x=3-2

x=1

B.x+5=4+6

x+5=10

x=10-5

x=5

C.7=4+x

x=7-4

x=3

D.4+x={3+5+7}+{3+5}

4+x=15+8

4+x=23

x=23-4

x=19

Bài 1 :

A.1+1=2

B.6+2+5=13

C.6+4+6+2+7=25

D.6+4+7+8=25

Bài 2 :

A.x+2=3

x=3-2

x=1

B.x+5=4+6

x+5=10

x=10-5

x=5

C.7=4+x

x=7-4

x=3

D.4+x={3+5+7}+{3+5}

4+x=15+8

4+x=23

x=23-4

x=19

Chúc bạn học tốt nha ~_~

8741418+54846852+65268478418654985897485+485495974549548941+95+556874418745985+989797594                                                                                                                                                                                 449859745264857897+5-5954567454187+97456415641874654+56454854564+48564165487-566555541++564564868456556486846589-6564644848654659898595985958948888555555.                         ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

1) 1/3 x 1/2 x 3/7 = 3/42 = 1/14

2) 5/4 x 1/3 +1/7 = 5/12 + 1/7 = 35/84 + 12/84 = 47/84

3) 8 x ( 8/9 - 2/3 ) = 8 x 2/9 = 16/9

4) 5/6 x 48/20 x 1/2 = 240/240 = 1

5) ( 2/5 + 3/4 ) + 8 = 23/20 + 8 = 23//20 + 160/20 = 183/20

6) 10 x ( 1/2 - 1/5 ) = 10 x 3/10 = 10/1 x 3/10 = 30/10 = 3

\(1,\)

\(A=-\frac{7}{12}+\frac{12}{18}+\frac{5}{4}\)

\(=-\frac{7}{12}+\frac{2}{3}+\frac{5}{4}\)

\(=-\frac{7}{12}+\frac{8}{12}+\frac{15}{12}\)

\(=\frac{-7+8+15}{12}\)

\(=\frac{4}{3}\)

\(1,\)

\(B=\frac{1}{4}-\frac{8}{7}:8-3:\frac{3}{4}.\left(-2\right)^2\)

\(=\frac{1}{4}-\frac{8}{7}.\frac{1}{8}-3.\frac{4}{3}.4\)

\(=\frac{1}{4}-\frac{1}{7}-16\)

\(=\frac{7-4-448}{28}\)

\(=-\frac{445}{28}\)

Mình đang bận, bạn cần gấp thế à? Trả lời trong tin nhắn nhé!!!

2.B=1/4-(8/7:8)-(3:3/8).(-2)^2=1/4-(8/7.1/8)-(3/1.4/3).(-2)^2=1/4-1/7-4.(-2)^2=1/4-1/7-16= 7/28-4/28-448/28= -445/28

a) y + 3/7 x 21/9 = 5

      y + 3/7 x 7/3 = 5

      y + 1             = 5

            y             = 4

b) y  x 3/5 - 1/2 = 4/5

    y x 3/5          = 4/5 + 1/2

    y x 3/5          = 13/10

    y                   = 13/6

c) 9/8 - y + 2/5 = 1/4

            y - 2/5  = 9 /8 - 1/4

            y - 2/5  = 7/8

                   y   = 51/40 

d) y - 6/5 : 2/3 = 5/6

    y - 9/5         = 5/6

          y           = 79/30

e) y : 7/8 + 3/4 = 7/4

    y : 7/8          = 1

          y            = 7/8

\(y+\frac{3}{7}\times\frac{21}{9}=5\)

\(y+\frac{3}{7}\times\frac{7}{3}=5\)

\(y+1=5\)

\(\Rightarrow y=4\)

\(A=\left(a\text{x}7+a\text{x}8-a\text{x}15\right):\left(1+2+3+...+10\right)\)

\(A=\left(a\text{x}\left(7+8-15\right)\right):\left(1+2+3+...+10\right)\)

\(A=\left(a\text{x}0\right):\left(1+2+3+..+10\right)\)

\(A=0:\left(1+2+3+...+10\right)\)

\(A=0\)

\(B=\left(18-9\text{x}2\right)\text{x}\left(2+4+6+8+10\right)\)

\(B=\left(18-18\right)\text{x}\left(2+4+6+8+10\right)\)

\(B=0\text{x}\left(2+4+6+8+10\right)\)

\(B=0\)

Câu trả lời B=0

1. 41/7 - x = 25/9

=> x = 41/7 - 25/9

=> x = 194/63

2. 3x = 12,8

=> x = 12,8 : 3

=> x = 64/15

3. 41/2 x = 5

=> x = 5: 41/2

=> x = 10/41

4. 3/4 x = 1

=> x = 1: 3/4

=> x = 3/4

5. 4/5 : x = 3

=> x = 4/5 : 3

=> x = 4/15

6. 12/x = 4

=> x = 12/4

=> x = 3

7. 4/7 : x = 4/7

=> x = 4/7 : 4/7

=> x = 1

8. 2x - 3/4 = 7/8

=> 2x = 7/8 + 3/4

=> 2x = 13/8

=> x = 13/8 : 2

=> x =13/16

Ruby Chan :))

1, \(4\frac{1}{7}-x=2\frac{5}{9}\)

\(\frac{4\times7+1}{7}-x=\frac{2\times9+5}{9}\)

\(\frac{29}{7}-x=\frac{23}{9}\)

\(x=\frac{29}{7}-\frac{23}{9}\)

\(x=\frac{261}{63}-\frac{161}{63}\)

\(x=\frac{100}{63}\)

2, \(3\times x=12,18\)

\(x=12,18\div3\)

\(x=4,06\)

3, \(4\frac{1}{2}\times x=5\)

\(\frac{4\times2+1}{2}\times x=5\)

\(\frac{9}{2}\times x=5\)

\(x=5\div\frac{9}{2}\)

\(x=\frac{5\times2}{9}=\frac{10}{9}\)

4, \(\frac{3}{4}\times x=1\)

\(x=1\div\frac{3}{4}\)

\(x=\frac{1\times4}{3}=\frac{4}{3}\)

5, \(\frac{4}{5}\div x=3\)

\(x=\frac{4}{5}\div3\)

\(x=\frac{4}{5\times3}=\frac{4}{15}\)

6,\(\frac{12}{x}=4\)

\(x=12\div4\)

\(x=3\)

7, \(\frac{4}{7}\div x=\frac{4}{7}\)

\(x=\frac{4}{7}\div\frac{4}{7}\)

\(x=1\)

8, \(2x-\frac{3}{4}=\frac{7}{8}\)

\(2x=\frac{7}{8}+\frac{3}{4}\)

\(2x=\frac{7}{8}+\frac{6}{8}\)

\(2x=\frac{13}{8}\)

\(x=\frac{13}{8}\div2\)

\(x=\frac{13}{8\times2}=\frac{13}{16}\)

8-4 : 3/4 =8-13/4

3/7:3/5 -4/7 =5/7-4/7=1/7

5/8 x 2/5 + 5/8 x3/5 =5/8 x (2/5+3/5)=5/8 x 1=5/8

$#flo2k9$

`8 - 4 : 3/4 = 8 - 4 xx 4/3 = 8 - 16/3 = 8/3`

`3/7 : 3/5 - 4/7 = 3/7 xx 5/3 - 4/7 = 5/7 - 4/7 = 1/7`

`5/8 xx 2/5 + 5/8 xx 3/5 = 5/8 xx ( 2/5 + 3/5) = 5/8 xx 1= 5/8`

8-4 : 3/4 = =\(8-4x\dfrac{4}{3}=8-\dfrac{16}{3}=\dfrac{24}{3}-\dfrac{16}{3}=\dfrac{8}{3}\)

3/7:3/5 -4/7 = \(\dfrac{3}{7}x\dfrac{5}{3}-\dfrac{4}{7}=\dfrac{5}{7}-\dfrac{4}{7}=\dfrac{1}{7}\)

5/8 x 2/5 + 5/8 x3/5 = \(\dfrac{5}{8}x\left(\dfrac{2}{5}+\dfrac{3}{5}\right)=\dfrac{5}{8}x1=\dfrac{5}{8}\)