1+3+5+..+(21-1)=225
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\(\frac{7}{18}\)\(+\frac{5}{3}\)\(+1\frac{3}{9}\)\(:\frac{55}{4}\)
\(=\frac{7}{18}\)\(+\frac{30}{18}\)\(+\frac{12}{9}\)\(x\frac{4}{55}\)
\(=\frac{7}{18}\)\(+\frac{30}{18}\)\(+\frac{4}{3}\)\(x\frac{4}{55}\)
\(=\frac{37}{18}\)\(+\frac{16}{165}\)\(=\frac{2035}{990}\)\(+\frac{96}{990}\)\(=\frac{2131}{990}\)
7/18 + 5/3 + 1/3/9 : 55/4 = 7/18 + 5/3 + 16/165
= 37/18 + 16/165
= 2/151/990
a) 390-(x-7)=169:13
390-(x-7)=13
x-7=390-13
x-7=377
x=377-7
x=370
b)70-5.(x-3)=45
5.(x-3)=70-45
5.(x-3)=25
x-3=25:5
x-3=5
x = 5+3
x =8
c)(x-140):7=3^3-2^3.3
(x - 140) : 7 = 27 - 8 . 3
(x - 140) : 7 = 27 - 24
(x - 140) : 7 = 3
x - 140 = 3 . 7
x - 140 = 21
x = 21 + 140
x = 161
d) 2^x=32
=>2^x=2^5
=)x=5
e)6x^3 - 8 = 40
6x^3 = 48
x^3 = 8
x = 2
f)4x^3+15=47
4x^3 = 47 - 15
4x^3 = 32
x^3 = 32 : 4
x^3 = 8
x^3 = 23
x = 2
g)6x-5=5^48:5^46
6x-5=5^2
6x-5=25
6x =25+5
6x =30
x =30:6
x =5
h)10+2x=4^51:4^49
10+2x=4^2
10+2x=16
2x = 16 - 10
2x = 6
x = 6 : 2
x = 3
C1:10077
C2:23905
C3:1061
C4:19841
C5:10999
C6:25036
C7:1925
C8:6 chữ số khác nhau
C9: 53000 đồng
C10:Ý C mik đoán vậy
HT nha
\(\frac{4}{3}:\frac{7}{8}-\frac{1}{3}:\frac{7}{8}=\left(\frac{4}{3}-\frac{1}{3}\right):\frac{7}{8}=1\cdot\frac{8}{7}=\frac{8}{7}\)
\(\left(3x+2\right)^3\)\(=11x11^2\)\(=11^3\)
\(=>3x+2=11\)
\(3x=11-2=9\)
\(x=9:3=3\)
\(2n+1\)chia hết cho \(n-1\)
\(=>2\left(n+1\right)\)\(+1\)chia hết cho \(n-1\)
\(2\left(n+1\right)\)chia hết cho \(n-1\)
\(=>1\)chia hết cho \(n-1\)
\(ƯC\left(1\right)\)\(=-1;1\)
\(n-1=1\)\(=>n=2\)
\(n-1=-1=>n=0\)
1:16 tế bào
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