1. 

Ta có : 0,6 = \(\dfrac{3}{5}\)

Tổng số phần bằng nhau là : 

3 + 5 = 8 ( phần ) 

Số thứ nhất là : 

0,6 : 8 x 3 = 0,225 

Số thứ hai là : 

0,6 - 0,225 = 0,375

Đáp số : 0,225 và 0,375

2. 

X : 0,25 - X : 2 = 35 

⇔ X : \(\dfrac{1}{4}\) - \(\dfrac{1}{2}\) x X = 35

⇔ X x 4 - \(\dfrac{1}{2}\) x X = 35 

⇔\(\dfrac{7}{2}\) x X = 35 

⇔ X = 35 : \(\dfrac{7}{2}\)

⇔ X = 10 

Vậy X = 10 

1.TK (/hoi-dap/detail/266033345538.html) 

2.x : 0,25 - x : 2 = 35

x:1/4-x:2=35

x.4-x.1/2=35

x(4-1/2)=35

x.7/2=35

x=35:7/2

x=10

1) Đổi 0,6=3/5

Tổng số phần bằng nhau là 

3+5=8

Số bé là 

0,6:8x3=0,225

Số lớn là 

0,6-0,225=0,375

(Bạn vẽ sơ đồ ra nhé)

2)x : 0,25 - x : 2 = 35

x*4-x*\(\dfrac{1}{2}\)=35

x*(4-\(\dfrac{1}{2}\))=35

x*\(\dfrac{7}{2}\)=35

x=10

\(25\times323-22\times25-25\\ =25\times\left(323-22-1\right)\\ =25\times300\\ =7500\)

\(=25.\left(323-22-1\right)\)

\(=25.300=7500\)

=25x(323-22-1)

=25x300

=7500

a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)

\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)

\(=\dfrac{18}{29}\times\dfrac{37}{37}\)

\(=\dfrac{18}{29}\times1\)

\(=\dfrac{18}{29}\)

b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)

\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)

\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)

\(=\dfrac{31}{85}\times-1\)

\(=-\dfrac{31}{85}\)

c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)

\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)

\(=\dfrac{16}{53}:\dfrac{1}{17}\)

\(=\dfrac{16}{901}\)

c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)

\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)

\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)

\(=\dfrac{4}{15}\times\dfrac{31}{31}\)

\(=\dfrac{4}{15}\times1\)

\(=\dfrac{4}{15}\)

a: =18/29*(25/37+12/37)

=18/29

b: =31/85(11/19+12/19-42/19)

=-31/85

c; =16/53(9/17+8/17)=16/53

d: =4/15(12/31+19/31)=4/15

\(\frac{1}{4}\times45+0,25\times35+\frac{25}{100}\times19+25\%\)

\(=0,25\times45+0,25\times35+0,25\times19+0,25\)

\(=0,25\times\left(45+35+19+1\right)\)

\(=0,25\times100=25\)

\(\frac{1}{4}\cdot45+0.25\cdot35+\frac{25}{100}\cdot19+25\%\)

\(=0.25\cdot45+0.25\cdot35+0.25\cdot19+0.25\)

\(=0.25\left(45+35+19+1\right)\)

\(=0.25\cdot100\)

\(=25\)

\(=0,25.45+0,25.35+0,25.19+0,25.1\)

\(=0,25.\left(45+35+19+1\right)\)

\(=0,25.100\)

\(=25\)

a: \(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{18}{21}+\dfrac{3}{21}\right)+\dfrac{19}{32}+\dfrac{13}{32}=1+1+1=3\)

b: \(=35\cdot1.1\cdot25\cdot\left(7,5-7,5\right)=0\)

a: =(34+14)+(1821+321)+1932+1332=1+1+1=3=(43​+41​)+(2118​+213​)+3219​+3213​=1+1+1=3

b: $=35\cdot 1.1\cdot 25\cdot \left(7,5-7,5\right)=0$

a) 0,25x3/4-0,25x0,25+0,25x1/2

=0,25x(3/4-0,25+1/2)

=0,25x1

=0,25

b) 5,68x8+56,8x0,1+56,8:10

=5,68x8+5,68+5,68

=5,68x(8+1+1)

=5,68x10

=56,8

a) 0,25x3/4-0,25x0,25+0,25x1/2

=0,25x(3/4-0,25+1/2)

=0,25x1

=0,25

b) 5,68x8+56,8x0,1+56,8:10

=5,68x8+5,68+5,68

=5,68x(8+1+1)

=5,68x10

=100x99=9900

25 x 33 x 4 x 3

= (25x 4) x (33x 3)

= 100 x 99

=9900

(25x4)x(33x3)

100x99

=9900