920,50 - 859,54 - 20,50

= 920,5 - 20,5 - 859,54

= 900,00 - 859,54

= 40,46.

920,50 - 895,54 - 20,50

= (920,50 - 20,50) - 895,54

= 900 - 895,54

= 4,46

\(920,50-895,54-20,50\)

\(=\left(920,50-20,50\right)-895,54\)

\(=900-895,54\)

\(=4,46\)

60,50 - 57,96 - 1,50

= (60,50 - 1,50) - 57,96

= 59 - 57,96

= 1,04

k mình nha

Mình cảm ơn các bạn nhiều

Thank you very much

60,50-57,96-1,50

=(60,50-1,50)-57,96

=59-57,96

=1,04

k nhà bn xong minh k lại cho

= (23 + 78 - 1) x 18,54

= 100 x 18,54

= 1854

= 18,54 x (23 + 78 - 1)

= 18,54 x 100

= 1854.

 23´ 18,54 + 78´ 18,54 - 18,54

= ( 23 + 78 - 1 ) x 18,54

= 100 x 18,54

= 1854

Để tìm ước chung lớn nhất (ƯCLN) của các số đã chọn, ta có thể sử dụng cách sau: 1. Sử dụng thuật toán Euclid để tìm ƯCLN: - ƯCLN(A.ưc(12,18)) = 6 - ƯCLN (B.ưc(18,54)) = 18 - ƯCLN(C.ưc(40,144)) = 8 - ƯCLN(D.ưc(35,130)) = 5 - ƯCLN(E.ưc(63,84)) = 21 - ƯCLN(F.ưc(18,54)) = 18 - ƯCLN(G.ưc(147,168,189)) = 21 - ƯCLN(H.ưc(18,30,77)) = 1 - ƯCLN(I.ưc(48) ,72,90)) = 6 2. Kết quả: - ƯCLN(A.ưc(12,18)) = 6 - ƯCLN(B.ưc(18,54)) = 18 - ƯCLN(C.ưc(40,144) ) = 8 - ƯCLN(D.ưc(35,130)) = 5 - ƯCLN(E.ưc(63,84)) = 21 - ƯCLN(F.ưc(18,54)) = 18 - ƯCLN(G.ưc( 147.168.189)) = 21 - ƯCLN(H.ưc(18,30,77)) = 1 - ƯCLN(I.ưc(48,72,90)) = 6

a: 12=2^2*3; 18=3^2*2

=>ƯCLN(12;18)=2*3=6

=>ƯC(12;18)={1;2;3;6}

b; 18=3^2*2; 54=2*3^3

=>ƯCLN(18;54)=2*3^2=18

=>ƯC(18;54)={1;2;3;6;9;18}

c: 40=2^3*5; 144=2^4*3^2

=>ƯCLN(40;144)=2^3=8

=>ƯC(40;144)={1;2;4;8}

d: 35=5*7

130=2*5*13

=>ƯCLN(35;130)=5

=>ƯC(35;130)={1;5}

e: 63=3^2*7; 84=2^2*3*7

=>ƯCLN(63;84)=2*3*7=21

=>ƯC(63;84)={1;3;7;21}

f: 18=2*3^2; 54=2*3^3

=>ƯCLN(18;54)=2*3^2=18

=>ƯC(18;54)={1;2;3;6;9;18}

g: 147=3*7^2

168=2^3*3*7

189=3^3*7

=>ƯCLN(147;168;189)=3*7=21

=>ƯC(147;168;189)={1;3;7;21}

h: ƯCLN(18;30;77)=1

=>ƯC(18;30;77)=1

i: 48=2^4*3

72=2^3*3^2

90=2*3^2*5

=>ƯCLN(48;72;90)=6

=>ƯC(48;72;90)={1;2;3;6}

\(x\in\left\{9;18\right\}\)

\(92,6-\left(x+25,8\right)=37,04\)

\(\Rightarrow x+25,8=92,6-37,04\)

\(\Rightarrow x+25,8=55,56\)

\(\Rightarrow x=55,56-25,8=29,76\)

\(92,6-\left(x+25,8\right)=37,04\)

\(\Rightarrow92,6-x-25,8=37,04\)

\(\Rightarrow66,8-x=37,04\)

\(\Rightarrow66,8-37,04=x\)

\(\Rightarrow x=29,76\)

Chỉ bài 2và3 đi

\(x\in\left\{9;18\right\}\)

\(ƯC\left(18,54\right)=Ư\left(18\right)=\left\{1;2;3;6;9;18\right\}\\ \Rightarrow x\in\left\{9;18\right\}\)

x ={9;18}

1.My house and your house are not the same.

My house .........................is different from yours.............................................................................................

2. Tam is 1,50 metres, and his cousin is 1,50 metres.

Tam…………………is the same height as his cousin…………………………………………………………………………

3. I like pork. My sister likes pork.

I like pork …………………………and so does my sister …………………………………………………..

4. Be careful or you’ll hurt yourself.

If you are .............................................careful, you won't hurt yourself............................................................................

5. They sell tickets at the gate of the tourist site.

Tickets .........................................are sold at the gate of the tourist site..................................................................................

6.They built these schools in 2000

These schools ……………………were built in 2000……………………………………………………………

7. A new hospital will be rebuilt next year

They ………………………will build a new hospital next year…………………………………………………………………

8.This picture was painted by Mary

Mary……………painted this picture…………………

1.My house and your house are not the same.

My house .........is diffrent from your house.........

2. Tam is 1,50 metres, and his cousin is 1,50 metres.

Tam……is 1,50 metres and his cousin is 1, 50 metres, too……………

3. I like pork. My sister likes pork.

I like pork ……and my sister likes, too………..

4. Be careful or you’ll hurt yourself.

If you are .......not be careful, you'll be hurt yourself.............

5. They sell tickets at the gate of the tourist site.

Tickets ..are sold at the gate of the tourist site..........

6.They built these schools in 2000

These schools …were built in 2000…

7. A new hospital will be rebuilt next year

They ………will build a new hospital next year………

8.This picture was painted by Mary

Mary…painted this picture………

a) 78 - x = 90

x = 78 - 90

x = -12

b) 15 + 2x = 5¹⁰ : 5⁸

15 + 2x = 5²

15 + 2x = 25

2x = 25 - 15

2x = 10

x = 10 : 2

x = 5

c) 48 : x + 17 = -33

48 : x + 17 = -33 - 17

48 : x = -50

x = 48 : (-50)

x = -24/25

d) Do x ⋮ 15 và x ⋮ 20

⇒ x ∈ BC(15; 20)

Ta có:

15 = 3.5

20 = 2².5

⇒ BCNN(15; 20) = 2².3.5 = 60

⇒ x ∈ BC(15; 20) = {0; 60; 120; ...}

Mà 50 < x < 70

⇒ x = 60