a. x-32.45 = 0

=> x - 32 = 0 : 45

=> x - 32 = 0

=> x        = 0 + 32

=> x        = 33

   Vậy x = 32 

b. 2448 : [119 - (x - 6)] câu này hình như sai đề hay sao đấy bạn

c. 25.( 52 - x) = 25

=> 52 - x        = 25 : 25

=> 52 - x        = 1

=>        x        = 52 - 1

=>        x        = 51

   Vậy x = 51

d. x - 84 : 42 = 21

=> x - 84       = 21.42

=> x - 84       = 882

=> x              = 882 + 84 

=> x             = 966

    Vậy x = 966

k mình nha, thks ^^

572 nha

hok tốt và nhớ k đúng chi mik

a: \(\frac{52}{17}>\frac{51}{17}=3\)

\(3=\frac{121}{41}>\frac{120}{41}\)

Do đó: \(\frac{52}{17}>\frac{120}{41}\)

b: \(\frac34+\frac14:\left(\frac{7}{12}-\frac16\right)\)

\(=\frac34+\frac14:\left(\frac{7}{12}-\frac{2}{12}\right)\)

\(=\frac34+\frac14:\frac{5}{12}\)

\(=\frac34+\frac14\times\frac{12}{5}=\frac34+\frac35=\frac{15}{20}+\frac{12}{20}=\frac{27}{20}\)

c: \(372,463\cdot998+744,926\)

\(=372,463\cdot998+372,463\cdot2\)

\(=372,463\times\left(998+2\right)=372,463\times1000=372463\)

d: Số số hạng trong dãy số 2;4;6;...;100 là:

\(\left(100-2\right):2+1=98:2+1=49+1=50\) (số)

\(2-4+6-8+10-12+\cdots+98-100+102\)

\(=\left(2-4\right)+\left(6-8\right)+\cdots+\left(98-100\right)+102\)

=(-2)+(-2)+...+(-2)+102

\(=-2\cdot\frac{50}{2}+102=-50+102=52\)

e: (y+112)-113=79

=>y+112-113=79

=>y-1=79

=>y=79+1=80

f: \(\frac34-y=\frac12\)

=>\(y=\frac34-\frac12=\frac14\)

g: \(\left(\frac45-2\times y\right)+\frac16=\frac56\)

=>\(\frac45-2\times y=\frac56-\frac16=\frac46=\frac23\)

=>\(2\times y=\frac45-\frac23=\frac{12}{15}-\frac{10}{15}=\frac{2}{15}\)

=>\(y=\frac{2}{15}:2=\frac{1}{15}\)

h: (y+1)+(y+2)+...+(y+50)=1750

=>50y+(1+2+...+50)=1750

=>\(50y+50\times\frac{51}{2}=1750\)

=>50y+1275=1750

=>50y=1750-1275=475

=>\(y=\frac{475}{50}=9,5\)

a: \(\frac{52}{17}>\frac{51}{17}=3\)

\(3=\frac{121}{41}>\frac{120}{41}\)

Do đó: \(\frac{52}{17}>\frac{120}{41}\)

b: \(\frac34+\frac14:\left(\frac{7}{12}-\frac16\right)\)

\(=\frac34+\frac14:\left(\frac{7}{12}-\frac{2}{12}\right)\)

\(=\frac34+\frac14:\frac{5}{12}\)

\(=\frac34+\frac14\times\frac{12}{5}=\frac34+\frac35=\frac{15}{20}+\frac{12}{20}=\frac{27}{20}\)

c: \(372,463\cdot998+744,926\)

\(=372,463\cdot998+372,463\cdot2\)

\(=372,463\times\left(998+2\right)=372,463\times1000=372463\)

d: Số số hạng trong dãy số 2;4;6;...;100 là:

\(\left(100-2\right):2+1=98:2+1=49+1=50\) (số)

\(2-4+6-8+10-12+\cdots+98-100+102\)

\(=\left(2-4\right)+\left(6-8\right)+\cdots+\left(98-100\right)+102\)

=(-2)+(-2)+...+(-2)+102

\(=-2\cdot\frac{50}{2}+102=-50+102=52\)

e: (y+112)-113=79

=>y+112-113=79

=>y-1=79

=>y=79+1=80

f: \(\frac34-y=\frac12\)

=>\(y=\frac34-\frac12=\frac14\)

g: \(\left(\frac45-2\times y\right)+\frac16=\frac56\)

=>\(\frac45-2\times y=\frac56-\frac16=\frac46=\frac23\)

=>\(2\times y=\frac45-\frac23=\frac{12}{15}-\frac{10}{15}=\frac{2}{15}\)

=>\(y=\frac{2}{15}:2=\frac{1}{15}\)

h: (y+1)+(y+2)+...+(y+50)=1750

=>50y+(1+2+...+50)=1750

=>\(50y+50\times\frac{51}{2}=1750\)

=>50y+1275=1750

=>50y=1750-1275=475

=>\(y=\frac{475}{50}=9,5\)

a)100-9:(372:3.y-1)-14=83

<=>100-9:(124y-1)-14=83

<=>86-9:(124y-1)=83

<=>9:(124y-1)=3

<=>124y-1=3

<=>124y=4

<=>y=\(\frac{1}{31}\approx0,3223\)

b)7260-120:24.y+924=528,3

<=>8184-5y=528,3

<=>5y=7655,7

<=>y=1531,14

c)2000-52:(615:3:y-15)-14=1984

<=>1986-52:(205:y-15)=1984

<=>52:(205:y-15)=2

<=>205:y-15=26

<=>205:y=41

<=>y=5

d)y+y.1/3+5/18=7/18

<=>4/3y=1/9

<=>y=1/12

e)13/15-(5/21+y)7/12=7/10

<=>7/12.(5/21+y)=1/6

<=>5/36+7/12y=1/6

<=>7/12y=1/36

<=>y=1/21\(\approx\)0,4762

h)y+2.y+3.y+...+10.y=49,5

<=>55y=49,5

<=>y=0,9

i)y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12)=1/24

<=>7991,364899y=1/24

<=>y=33/6329161

tích nha mỏi tay quá

70084 cm2

Số đó là: 432:80x100=540

1/6 số đó là: 540x1/6=90