520 + 1.625 = x + 35 + 30

    521.625  = x  + 65

                     x = 521.625 - 65

                     x = 456.625

=520+1.625=X+35+30

=521.625=X+65

=521.625-65=X

=456.625=X

=456 625

Ta có: 

a)   (285  - x - 0,15 ) : 0,25 = 15 : 0,25

     (285  - x - 0,15 ) = 15 

      284,85 - x = 15

       x = 284,85 - 15

       x = 269,85

269,85

đề sai bạn ơi

Thế để mình làm lại cho vậy, khổ ghê:

520 + 6,5 x 4 = \(\frac{X+175}{5}\)+ 30

520 + 26 = \(\frac{X+175}{5}\)+ 30

546 = \(\frac{X+175}{5}\)+ 30

\(\frac{X+175}{5}=546-30\)

\(\frac{X+175}{5}=516\)

\(\frac{X+175}{5}=\frac{2580}{5}\)

X + 175 = 2580

X = 2580 - 175

X = 2405

520 + 6,5 x 4 = X + \(\frac{175}{5}\)+ 30

520 + 26 = X + 35 + 30

546 = X + 65

X = 546 - 65

X = 481

bạn ơi x + 175 phần 5 cỏ chứ ko phải như bạn nghĩ đâu

\(a.\left(y.100-0,7357\right):0,01=0,55+15,88\)

\(\Leftrightarrow\left(100y-0,7357\right):0,01=16,43\)

\(\Leftrightarrow100y-0,7357=0,1643\)

\(\Leftrightarrow100y=0,9\)

\(\Leftrightarrow y=\frac{9}{1000}\)

\(b.14:\left(0,4+\frac{0,16}{y}\right)=7\)

\(\Leftrightarrow0,4+\frac{0,16}{y}=2\)

\(\Leftrightarrow\frac{0,16}{y}=1,6\)

\(\Leftrightarrow x=0,1\)

\(c.520+7,5.4=y+\frac{175}{5}+30\)

\(\Leftrightarrow520+30=y+65\)

\(\Leftrightarrow550=y+65\)

\(\Leftrightarrow y=485\)

520 +7,5 x 4 = \(\frac{X+175}{5}\)+ 30

<=>520+30=\(\frac{x+175}{5}\)+30

 <=>\(\frac{X+175}{5}\)+30 = 550

<=> \(\frac{X+175}{5}\)= 520

<=> X+175 = 2600

<=> X=2425

mik chưa lm đc bài 1

k mik nha

Câu 2

520 + 7,5 . 4 =   \(\frac{x+175}{5}\)+ 30 

520 + 30 =  \(\frac{x+175}{5}\)+ 30 

 \(\frac{x+175}{5}\)= 520

x + 175 = 2600

x  = 2425 

Vậy x = 2425 

Trả lời :

Bài 1 :

\(\frac{5,7.16,2+16,2.3,7-6,2.4,8-6,2.4,6}{13,4+12,3+11,2-10,4-11,5-12,6-0,4}\)

\(=\frac{16,2.\left(5,7+3,7\right)-6,2.\left(4,8-4,6\right)}{2}\)

\(=\frac{16,2.9,4-6,2.0,2}{2}\)

\(=\frac{151,04}{2}\)

\(=75,52\)

Bài 2 :

\(520+75.4=\frac{x+175}{5}+30\)

\(520+30=\frac{x+175}{5}+30\)

\(\frac{x+175}{5}+30=550\)

\(\frac{x+175}{5}=520\)

\(\Rightarrow x+175=2600\)

\(\Rightarrow x=2425\)

Hok_Tốt

#Thiên_Hy

a)\(x-5=-1\)

⇔\(x=4\)

b)\(x+30=-4\)

⇔\(x=-34\)

c)\(x-\left(-24\right)=3\)

⇔\(x+24=3\)

⇔\(x=-21\)

e)\(\left(x+5\right)+\left(x-9\right)=x+2\)

⇔\(x+5+x-9-x-2=0\)

⇔\(x-6=0\)

⇔\(x=6\)

f)\(\left(27-x\right)+\left(15+x\right)=x-24\)

⇔\(27-x+15+x-x+24=0\)

⇔\(66-x=0\)

⇔\(x=66\)

\(a.x-5=-1\)                      \(b.x+30=-4\)

\(x=\left(-1\right)+5\)                        \(x=\left(-4\right)-30\)

\(x=4\)                                    \(x=-34\)

\(c.x-\left(-24\right)=3\)                    \(e.\left(x+5\right)+\left(x-9\right)=x+2\)

\(x=3+\left(-24\right)\)                         \(x+5+x-9=x+2\)

\(x=-21\)                                  \(2x-4=x+2\)

                                                \(2x-x=2+4\)

                                                 \(x=6\)

\(f.\left(27-x\right)+\left(15+x\right)=x-24\)

\(27-x+15+x=x-24\)

\(27+15=x-24\)

\(42=x-24\)

\(x=24+42\)

\(x=66\)

bang 897

897chosao

89,7 : 0,5 + 89,7 x 3 + 89,7 x 5

= 179,4 + 89,7 x ( 3 + 5 )

= 179,4 + 89,7 x 8

= 179,4 + 717,6

= 897

a, x= \(\dfrac{1}{4}\)

b, x= \(\dfrac{1}{5}\)

x=-2/4+3/4                             x=1/4

6x/30=25/30+-19/30                       6x/30=6/30            6x=6          x=1

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