\(\dfrac{x}{0,2}=\dfrac{y}{0,75}=\dfrac{z}{0,125}\)

\(\Rightarrow\dfrac{x^2}{\left(0,2\right)^2}=\dfrac{y^2}{\left(0,75\right)^2}=\dfrac{z^2}{\left(0,125\right)^2}=\dfrac{x^2+y^2+z^2}{\left(0,2\right)^2+\left(0,75\right)^2+\left(0,125\right)^2}=\dfrac{3956}{2^2.10^{-4}+75^2.10^{-4}+125^2.10^{-4}}=\dfrac{3956}{10^{-4}.\left(4+5625+15625\right)}=\dfrac{3956.10^4}{21254}\)

\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{3956.10^4}{21254}.0,2=\dfrac{7912.10^3}{21254}\\y=\dfrac{3956.10^4}{21254}.0,75=\dfrac{29670.10^3}{21254}\\z=\dfrac{3956.10^4}{21254}.0,125=\dfrac{4945.10^3}{21254}\end{matrix}\right.\)

Vậy \(M=x+y+z=\dfrac{7912.10^3+29670.10^3+4945.10^3}{21254}\)

\(M=\dfrac{\left(7912+29670+4945\right).10^3}{21254}=\dfrac{42527.10^3}{21254}\)

ko bt

\(a)101\times0,75-0,75\)

\(=0,75\times(101-1)\)

\(=0,75\times100=75\)

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`b)10:0,5+4:0,25+8:0,125`

\(=10\times2+4\times4+8\times8\)

\(=5\times4+4\times4+4\times16\)

\(=4\times(5+4+16)\)

\(=4\times25=100\)

$a)101\times 0,75-0,75$

$=0,75\times (101-1)$

$=0,75\times 100=75$

___________________________________________

$b)10:0,5+4:0,25+8:0,125$

$=10\times 2+4\times 4+8\times 8$

$=5\times 4+4\times 4+4\times 16$

$=4\times (5+4+16)$

$=4\times 25=100$

a) y=1,8:0,75=2,4
b) y=0,483:0,15=3,22
c) y=2,7+(3,48:1,45)=5,1
d) y=(0,125+0,5):0,25=0,7

Ta thấy : 

  ( 0,2 - 0,125 ) < a < 11,05

=   0,075          < a < 11,05

Vậy a = 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9 ; 10 ; 11 .

sai đề câu a rồi hay sao bạn ơi bạn thử kiểm lại đi nhé

ủa dễ mà đáp an là a 01682

a, 15,5: 0,125 + 15,5: 0,2+ 15,5:0,5 + 15,5:0,25

= 15,5 \(\times\) 8 + 15,5 \(\times\) 5 + 15,5 \(\times\) 2 + 15,5 \(\times\) 4

= 15,5 \(\times\)8 + 15,5 \(\times\) 5 + 15,5 \(\times\)2 + 15,5 \(\times\) 5 - 15,5

= 15,5 \(\times\) ( 8 + 5 + 2 + 5) - 15,5

= 15,5 \(\times\)   20 - 15,5

= 310 -15,5

= 294,5

b, 22,1 : 0,25 + 22,1 : 0,5 + 22,1 : 0,2 + 22,1: 0,125

= 22,1 \(\times\) 4 + 22,1 \(\times\)2 + 22,1 \(\times\) 5 + 22,1 \(\times\) 8

= 22,1 \(\times\) 5 - 22,1 + 22,1 \(\times\) 2 + 22,1 \(\times\) 5 + 22,1 \(\times\) 8

= 22,1 \(\times\) ( 5 + 2 + 5 + 8)  - 22,1

= 22,1 \(\times\) 20 - 22,1

= 442 - 22,1

= 419,9

Địt con mẹ mày nhắn lắm thế

a) x : 0,125 - x = 45

x * 1/8 - x = 45

x * (1/8 - 1) = 45

x * -7/8 = 45

x = -360/7

b) x : 0,2 + x * 5 - x : 0,25 = 54,75 

x * 1/5 + x * 5 - x * 1/4 = 54,75

x * (1/5 + 5 - 1/4) = 54,75

x * 99/20 = 54,75

x = 365/33

a) \(x:0,125-x=45\)

\(x:\dfrac{1}{8}-x=45\\ x\times8-x=45\\ x\times\left(8-1\right)=45\\ 7\times x=45\\ x=45:7\\ x=\dfrac{45}{7}\)

b) \(x:0,2+x\times5-x:0,25=54,75\)

\(x:\dfrac{1}{5}+x\times5-x:\dfrac{1}{4}=54,75\\ x\times5+x\times5-x\times4=54,75\\ x\times\left(5+5-4\right)=54,75\\ x\times6=54,75\\ x=54,75:6\\ x=9,125\)