\(\frac{3}{4}+6,8+0,25+0,5+\frac{1}{5}+\frac{1}{2}\)

\(=0,75+6,8+0,25+0,5+0,2+0,5\)

\(=\left(0,75+0,25\right)+\left(6,8+0,2\right)+\left(0,5+0,5\right)\)

\(=1+7+1\)

\(=9\)

3/4+6.8+0.25+0.5+1/5+1/2 =9

3/4 + 6,8 + 0,25 + 0,5 + 1/5 + 1/2 = [ 3/4 + 6,8 ] + [ 1/5 + 0,25 ] + [ 0,5 + 1/2 ]

=1 + 7 + 1

= 9

Câu 1.0,5+0,5=1

Câu 2.0,25+0,25=0,5

Câu 3.0,125+0,125=0,25

Câu 4.0,0625+0,0625=0,125

Câu 5.15,39+25,5=40,89

1.=1

2.=0,5

3.=0,25

4.=0,125

5.=4089.

câu 1 ; 1

câu 2: 0,5

câu 3;0.25

câu 4 : 0.125

câu 5 :40,89

a: \(24,8:0,5+24,8\cdot3+24,8:0,2\)

\(=24,8\cdot2+24,8\cdot3+24,8\cdot5\)

\(=24,8\left(2+3+5\right)\)

\(=24,8\cdot10=248\)

b: \(19,5+19,5\cdot3+19,5:0,5+19,5:0,25\)

\(=19,5+19,5\cdot3+19,5\cdot2+19,5\cdot4\)

\(=19,5\left(1+3+2+4\right)\)

\(=19,5\cdot10=195\)

c: \(121,07\cdot4+121,07:0,25+121,07:0,5\)

\(=121,07\cdot4+121,07\cdot4+121,07\cdot2\)

\(=121,07\left(4+4+2\right)\)

\(=121,07\cdot10=1210,7\)

a) 11 : 4 + 5,3 x 3,8
= 3,75 + 5,3 x 3,8
= 3,75 + 20,14
= 23,89
b) 16,52 : 0,5 - 2,7 : 0.25
= 33,04 - 2,7 : 0,25
= 33,04 - 10,8
= 22,24
c) 7/5 : 2/3 : 1,05 - 4/9
= 7/5 : 2/3 : 21/20 - 4/9
= 7/5 x 3/2 x 20/21 - 4/9
= (1 x 3 x 2)/ (1 x 1 x 3)
= 6/3
= 2

a 2.75+20.4=22.89

b 33.04-10.8=22.24

a) 11 : 4 + 5,3 x 3,8
= 2,75 + 5,3 x 3,8
= 2,75 + 20,14
= 22,89
b) 16,52 : 0,5 - 2,7 : 0.25
= 33,04 - 2,7 : 0,25
= 33,04 - 10,8
= 22,24
c) 7/5 : 2/3 : 1,05 - 4/9
= 7/5 : 2/3 : 21/20 - 4/9
= 7/5 x 3/2 x 20/21 - 4/9
= (1 x 3 x 2)/ (1 x 1 x 3)
= 6/3
= 2

\(0,5+\dfrac{4}{3}:0,25=\dfrac{1}{2}+\dfrac{4}{3}:\dfrac{1}{4}=\dfrac{1}{2}+\dfrac{4}{3}\times4=\dfrac{1}{2}+\dfrac{16}{3}=\dfrac{3}{6}+\dfrac{32}{6}=\dfrac{35}{6}\)

`0,5+4/3:0,25`

`= 0,5+16/3`

`= 35/6`

0,5 + 4/3 : 0,25=1/2+4/3x4/1=1/2+16/3=35/6

\(\frac{3}{4}+6,8+0,25+0,5+\frac{1}{2}+\frac{1}{5}=\left(\frac{3}{4}+0,25\right)+\left(6,8+\frac{1}{5}\right)+\left(0,5+\frac{1}{2}\right)\)

                                                                  \(=\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{34}{5}+\frac{1}{5}\right)+\left(\frac{1}{2}+\frac{1}{2}\right)\)

                                                                  \(=1+7+1=9\)

3/4 + 6,8 + 0,25 + 0,5 + 1/2 + 1/5 

= 9

Chúc bn hok tốt

Ta có : 

\(\frac{3}{4}+\frac{6}{8}+0,25+0,5+\frac{1}{2}+\frac{1}{5}\)

\(=\frac{3}{4}+\frac{3}{4}+\frac{1}{4}+\frac{1}{2}+\frac{1}{2}+\frac{1}{5}\)

\(=\left(\frac{3}{4}+\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{1}{2}+\frac{1}{2}\right)+\frac{1}{5}\)

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

\(=1,25+1+0,2\)

\(=2,25+0,2\)

\(=2,45\)

a)   \(4x-3=4-3x\)

\(\Leftrightarrow\)\(7x=7\)

\(\Leftrightarrow\)\(x=7\)

Vậy...

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

\(\Leftrightarrow\)\(3+x-5=6x-4\)

\(\Leftrightarrow\)\(5x=2\)

\(\Leftrightarrow\)\(x=\frac{2}{5}\)

Vậy...

a)4x-3=4-3x

<=>4x+3x=4+3

<=>7x=7

<=>x=1

\(\text{b)3+x-5=}6x-4\Leftrightarrow x-6x=-4+5-3\Leftrightarrow-5x=-2\Leftrightarrow x=\dfrac{2}{5}\)

vậy S=\(\left\{\dfrac{2}{5}\right\}\)

do ngu

chỉ có một lần cân bằng cân Rôbecvan và 1 quả cân 1kg làm thế nào ta có thể lấy 2kg gạo ra khỏi bao gạo chứa 5kg