x:1/7=15,4+41,3

x:1/7=56,7

x=56,7x1/7

x=8,1          

\(y:\frac{1}{7}=15,4+41,3\)

\(\Rightarrow y:\frac{1}{7}=56,7\)

\(\Rightarrow y=56,7.\frac{1}{7}=8,1\)

vậy y = 8,1

y : 1/7 =  56,7

y = 56,7 x 1/7

y = 8,1

1

a)48,124

b)-28,538

c)56,96

d)111,5

Câu 2

a)132,1

b)21,35

Câu 3

a)4,8

b)71,5

GIÚP MÌNH VỚI MN ƠIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

\(A=\dfrac{\left(20.5\right)^5.5^5}{100^5}=\dfrac{100^5.3125}{100^5}=3125\)

\(B=\dfrac{\left(0,3.3\right)^5}{\left(0,3\right)^5.0,3}=\dfrac{\left(0,3\right)^5.3^5}{\left(0,3\right)^5.0,3}=\dfrac{3^5}{0,3}=810\)

\(A=\dfrac{2^{10}\cdot5^5\cdot5^{10}}{2^{10}\cdot5^{10}}=5^5=3125\\ B=\left(\dfrac{0,9}{0,3}\right)^5\cdot\dfrac{1}{0,3}=\dfrac{3^5}{0,3}=\dfrac{243}{0,3}=810\)

a) `1/9-0,3. 5/9+1/3`

`=1/9-3/10 . 5/9+1/3`

`=1/9-15/90+1/3`

`=1/9-1/6+1/3`

`=2/18-3/18+6/18`

`=5/18`

b) `(-2/3)^2+1/6-(-0,5)^3`

`=4/9+1/6-(-0,125)`

`=4/9+1/6+0,125`

`=4/9+1/6+1/8`

`=32/72+12/72+9/72`

`=53/72`

x=30,24-15,67

x=14,57

Câu 2 ko biết làm nha 

x:25,1=14

x=14 nhân 25,1

x=3314

a 1229

b 578

a: 321+908=1229

b: 676-98=578

a: 321

+908

_____

1229

b: 676

-98

_____

578

1 . 345.01 : 3.5 = 98.5742

2 . 0,25 x 32,7 x 0,4 = 3,27

3 . 16,62 x 0,4 + 0,25 x 16,2 + 0,35 x 16,2 = 33,24