{2.9+[144-25x(15-169/13)}]-1
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{ 2 . 32 + [ 144 - 52 . ( 15 - 169 : 13 ) ] } - 12019
= { 2 . 9 + [ 144 - 25 . ( 15 - 13 ) ] } - 1
= { 18 + [ 144 - 25 . 2 ] } - 1
= { 18 + [ 144 - 50 ] } - 1
= 18 + 94 - 1
= 112 - 1
= 111
{2 . 3^2 + (144 - 5^2 . (15 - 169 : 13))} - 1^2019
= {2 . 9 + (144 - 25 . ( 15 - 169 : 13))} - 1
= {2 . 9 + (144 - 25 . ( 15 - 13))} - 1
= {2 . 9 + (144 - 25 . 2)} - 1
= {2 . 9 + (144 - 50)} - 1
= {2 . 9 + 94} - 1
= {18 + 94} - 1
= 112 - 1
= 111
\(\left(2\cdot3^2+\left(144-5^2\cdot\left(15-169:13\right)\right)\right)-9999^0\)
\(=\left(2\cdot9+\left(144-25\cdot\left(15-13\right)\right)\right)-1\)
\(=\left(18+\left(144-25\cdot2\right)\right)-1\)
\(=\left(18+\left(144-50\right)\right)-1\)
\(=\left(18+94\right)-1\)
\(=112-1\)
\(=111\)
a) \(96 : 2^4 + 3^2 - 2018^0 \)
= 96 : 16 + 9 - 1
= 6 + 9 - 1
= 15 - 1
= 14
b) 32 . 77 + 33 . 24 - 32
= 2541 + 768 - 32
= 3309 - 32
= 3327
c) \({2 . 3^2 + [144 - 5^2 . (15 - 169 : 13)]} - 1^2019\)
1^2019 nha bạn
= 2 . 9 + [144 - 25 . (15 - 169 : 13)]}- 1
= 2 . 9 + [144 - 25 . (15 - 13)]}- 1
= 2 . 9 + [144 - 25 . 2]}- 1
= 2 . 9 + [144 - 50]}- 1
= 2 . 9 + 94 - 1
= 18 + 94 - 1
= 112 - 1
= 111
d) 5^27 . 5 : 5^25 + -125 = 0
1: 8=2^3
2: 25=5^2
3: 4=2^2
4: 49=7^2
5: 81=9^2
6: 36=6^2
7: 100=10^2
8: 121=11^2
9: 144=12^2
10: 169=13^2
11: 27=3^3
12: 125=5^3
13: 1000=10^3
14: 32=2^5
15: 243=3^5
16: 343=7^3
17: 216=6^3
18: 64=4^3
19: 225=15^2
20: 128=2^7
Lời giải:
Áp dụng tính chất dãy tỉ số bằng nhau:
$\frac{3x+25}{144}=\frac{2y-169}{25}=\frac{z+144}{169}=\frac{3x+25+2y-169+z+144}{144+25+169}=\frac{(3x+2y+z)+25-169+144}{144+25+169}=\frac{1}{2}$
Suy ra:
$3x+25=144.\frac{1}{2}=72\Rightarrow x=\frac{47}{3}$
$2y-169=25.\frac{1}{2}\Rightarrow y=\frac{363}{4}$
$z+144=169.\frac{1}{2}\Rightarrow z=\frac{-119}{2}$
P/s: Lần sau bạn lưu ý ghi đầy đủ yêu cầu đề bài.
\(\frac{144}{17}x\frac{34}{12}=24\)
\(\frac{169}{34}:\frac{13}{68}=26\)
N is: 25
\(M=\frac{2^{13}.3^7}{2^{15}.3^2.9^2}=\frac{2^{13}.3^7}{2^{13}.2^2.3^2.\left(3.3\right)^2}=\frac{2^{13}.3^7}{2^{13}.2^2.3^8}=\frac{1}{4.3}=\frac{1}{12}\)
a)128-(x+56)=15
x+56=128-15
x+56=113
x=113-56
x=57
b)45+(34-x)=67
34-x=67-45=22
x=34-22
x=12
a) \(A=\dfrac{2^6\cdot9^2}{6^4\cdot8}\)
\(=\dfrac{2^6\cdot\left(3^2\right)^2}{3^4\cdot2^4\cdot2^3}\)
\(=\dfrac{2^6\cdot3^4}{3^4\cdot2^7}\)
\(=\dfrac{1}{2}\)
b) \(B=\dfrac{2^{13}\cdot3^7}{2^{15}\cdot3^2\cdot9^2}\)
\(=\dfrac{2^{13}\cdot3^7}{2^{15}\cdot3^2\cdot\left(3^2\right)^2}\)
\(=\dfrac{2^{13}\cdot3^7}{2^{15}\cdot3^6}\)
\(=\dfrac{3}{2^2}\)
\(=\dfrac{3}{4}\)
{2.9+[144-25x(15-169/13)}]-1
=2.9+[144-25.(15-13]]-1
=2.9+[144-25.2]]]-1
=2.9+[144-50]]]-1
=18+94-1
=111
Chúc bn học tốt
{2.9+[144-25x(15-169/13)]}-1
=2.9+[144-25.(15-13)]-1
=2.9+[144-50]-1
=18+94-1
=112-1
=111