2.(38.13 13.11) : 27 - 2021 mũ 0
h) 2.(38.13 - 13.11): 27 - 2021 mũ 0
\(=26\left(38-11\right):27-1\)
=26-1
=25
83 + (-29 ) + 27 - 171
5 mũ 9 : 5 mũ 7 + 2. ( 23 + 2 ) - 2021 mũ 0
83 + (-29 ) + 27 - 171
5 mũ 9 : 5 mũ 7 + 2. ( 23 + 2 ) - 2021 mũ 0
a: =110-200=-90
b: =25+50-1=74
a) - 23+150(-9)+1913
b) 2 MŨ2 .5 + ( 49 – 17 MŨ 2 )
c) 25. 69 + 31. 25 – 150; d) 198 : [130 – (27 – 19 ) MŨ 2] + 2021 MŨ 0
b: =20+49-289=20-240=-220
27 . 65 + 27 . 35 + 300
3838 : [( 190 - 6 . 5 mũ 2 ) : 4 + 3 }
2022 - x = 2021
26 + 14 : ( x - 5 ) = 33
2 . 3 mũ x + 38 = 92
a)\(27.65+27.35+300=27.\left(65+35\right)+300\)
\(=27.100+300=2700+300=3000\)
b)\(3838:\left[\left(190-6.5^2\right):4+3\right]\)
\(=3838:\left[\left(190-6.25\right):4+3\right]\)
\(=3838:\left[\left(190-150\right):4+3\right]\)
\(=3838:\left[40:4+3\right]=3838:\left[10+3\right]\)
\(=3838:13=\dfrac{3838}{13}\)
c)\(2022-x=2021\)
\(x=2022-2021=1\)
d)\(26+14:\left(x-5\right)=33\)
\(14:\left(x-5\right)=33-26=7\)
\(x-5=14+7=2\)
\(x=2+5=7\)
e)đề hỏi làm j thế bạn
Tìm x :
a, 2640+(( 900 -3x )/45)*24=3000
b, 1404:(118-(4x+6))=27
c, 16/8x-2019/2021
d, 5xmũ 2 -3x=0
e, 3(x-1)+4(x-1)mũ 2 =0
f,2(x-2) mũ 2 =(x-2)
g, (x-2020) mũ 4 = ( x-2020) mũ 2
b. 1404 : [118 - (4x + 6)] = 27
118 - (4x + 6) = 52
4x + 6 = 66
4x = 60
x = 15
d) \(5x^2-3x=0\)
\(\Leftrightarrow x\left(5x-3\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\5x-3=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x=\frac{3}{5}\end{cases}}\)
e) \(3\left(x-1\right)+4\left(x-1\right)^2=0\)
\(\Leftrightarrow\left(x-1\right)\left[3-4.\left(x-1\right)\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-1=0\\3-4\left(x-1\right)=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=1\\4\left(x-1\right)=3\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=1\\x-1=\frac{3}{4}\Rightarrow x=\frac{7}{4}\end{cases}}\)
f) \(2\left(x-2\right)^2=\left(x-2\right)\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\2\left(x-2\right)-1=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=2\\x-2=\frac{1}{2}\Rightarrow x=\frac{5}{2}\end{cases}}\)
g) \(\left(x-2020\right)^4=\left(x-2020\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}\left(x-2020\right)^2=0\\\left(x-2020\right)^2-1=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=2020\\x=2019,x=2021\end{cases}}\)
4.5 mũ 2 – 3 mũ 2 . ( 2021 mũ 0 + 3 mũ 2 ) dúp mình với ạ
\(4\cdot5^2-3^2\cdot\left(2021^0+3^2\right)\)
\(=4\cdot25-9\cdot\left(1+9\right)\)
\(=100-9\cdot10\)
\(=100-90\)
\(=10\)
4. 52- 32. ( 20210+ 32)
= 4 . 25 - 9 . ( 1 + 9 )
= 100 - 9 . 10
= 100-90
= 10
(-1/2) mũ 2 : (1 và 5/16 - 1,5) + 2021 mũ 0
\(\left(-\dfrac{1}{2}\right)^2:\left(1\dfrac{5}{16}-1,5\right)+2021^0\)
\(=\dfrac{1}{4}:\left(\dfrac{21}{16}-\dfrac{24}{16}\right)+1\)
\(=\dfrac{1}{4}:\left(-\dfrac{3}{16}\right)+1\)
\(=-\dfrac{4}{3}+\dfrac{3}{3}\)
\(=-\dfrac{1}{3}\)
`(-1/2)^2 : (1 5/16 - 1,5) + 2021^0`
`= 1/4 : ( 21/16 - 1,5) +1`
`= 1/4 : (-3/16)+1`
`= 1/4 xx (-16/3) +1`
`=-4/3+1`
`= -4/3 + 3/3`
`= -1/3`
(−12)2:(1 516−1,5)+20210(-12)2:(1 516-1,5)+20210
=14:(2116−1,5)+1=14:(2116-1,5)+1
=14:(−316)+1=14:(-316)+1
=14×(−163)+1=14×(-163)+1
=−43+1=-43+1
=−43+33=-43+33
=−13 cái này làm tắt đc ạ. Em ko chắc lắm
A tính : 42+13.11-3.2 mũ 3
B tìm x biết : 23+3.(x+5)=5 mũ 6 : 5 mũ 3
C tìm số 5a27b, biết số đó chia hết cho cả 2 cả 5 và 9