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314 : ( 39.27 ) + 52.25 - 43
= 314 : ( 39.33) + 52.25 - ( 22)3
= 314 : 312 + 52.25 - 26
= 32 + 25.(25 - 2)
= 9 + 32.23
= 9 + 736
=745
23.5 - 32.4 + 4.6
= 23.5 - 32.22 + 22.2.3
= 22.( 2.5 - 9 + 2.3)
= 4 .( 10 - 9 + 6 )
= 4 . 7
= 28
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a: =5-78*32
=5-2496
=-2491
b: \(=6\left(9-6\right)=6\cdot3=18\)
c: \(=46\cdot\dfrac{\left(123-42\right)}{81}=46\)
d: \(=181+3-84+8\cdot25\)
=100+200
=300
e: \(=64\cdot35+140\cdot84-1=2240-1+11760\)
=14000-1
=13999
f: \(=3^3+25\cdot8-1=26+200=226\)
g: \(=3+2^4+1=16+4=20\)
h: \(=36:4\cdot3+2\cdot25-1=27+50-1=27+49=76\)
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1. 25 : 5,7 = 250/57
2. 30:2.8.4 = 480
3. 20:2^2.14= 70
4. 125:5^3.170= 170
5. 64:2^5.30.4=240
6. (25:5^2.30): 15.7=14
bạn à! Nhiều quá mình ko làm hết được. sorry nha.^-^
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a: \(=\dfrac{-4\cdot13\cdot9\cdot5}{3\cdot4\cdot5\cdot2\cdot13}=\dfrac{3}{2}\)
b: \(=\dfrac{1}{2}\cdot\dfrac{1}{3}\cdot5=\dfrac{5}{6}\)
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\(6^2.2^2.5:\left[3.12-\left(2x-6\right)\right]=2^3.5\)
\(\Rightarrow36.4.5:\left[36-\left(2x-6\right)\right]=8.5\)
\(\Rightarrow720:\left[36-\left(2x-6\right)\right]=40\)
\(\Rightarrow36-\left(2x-6\right)=720:40=18\)
\(\Rightarrow2x-6=36-18=18\)
\(\Rightarrow2x=18+6=24\)
\(\Rightarrow x=24:2=12\)
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Ta có: \(5^2\cdot x-3-2\cdot2^5=5^2\cdot3\)
\(\Leftrightarrow25\cdot x-3-64=75\)
\(\Leftrightarrow25\cdot x=122\)
hay \(x=\dfrac{122}{25}\)
Vậy: \(x=\dfrac{122}{25}\)
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\(3^2.2^4-2^3.4^2-2^3.5^0+4^2.2^2\)
\(=9.16-8.16-8.1+16.4\)
\(=16.\left(9-8\right)-8+64\)
\(=16.1-8+64\)
\(=8+64\)
\(=72\)
5^2x-3=50+75
5^2x=125
=>x=125:25
=>x=5
\(\left(5^2x-3\right)-3.5^2=5^2.2\)
<=>\(\left(25x-3\right)-3.25=25.2\)
<=>\(\left(25x-3\right)-75=50\)
<=>\(\left(25x-3\right)=125\)
<=>\(25x-3=125\)
<=>\(x-3=125:25\)
<=>\(x-3=5\)
<=>\(x=8\)