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\(x\div4\frac{1}{3}=-2,5\)
\(\Leftrightarrow x\div\frac{13}{3}=\frac{-5}{2}\)
\(\Leftrightarrow x=\frac{-5}{2}.\frac{13}{3}\)
\(\Leftrightarrow x=\frac{-65}{6}\)
\(x\div\frac{-3}{5}=\frac{-10}{21}\)
\(\Leftrightarrow x=\frac{-10}{21}.\frac{-3}{5}\)
\(\Leftrightarrow x=\frac{30}{105}\)
\(\Leftrightarrow x=\frac{2}{7}\)
\(\frac{2}{3}x-\frac{1}{2}=\frac{1}{10}\)
\(\Leftrightarrow\frac{2}{3}x=\frac{1}{10}+\frac{1}{2}\)
\(\Leftrightarrow\frac{2}{3}x=\frac{6}{10}\)
\(\Leftrightarrow x=\frac{6}{10}\div\frac{2}{3}\)
\(\Leftrightarrow x=\frac{18}{20}\)
\(\Leftrightarrow x=\frac{9}{10}\)
\(\frac{1}{2}x+\frac{1}{2}=\frac{5}{2}\)
\(\Leftrightarrow\frac{1}{2}\left(x+1\right)=\frac{5}{2}\)
\(\Leftrightarrow\left(x+1\right)=\frac{5}{2}\div\frac{1}{2}\)
\(\Leftrightarrow\left(x+1\right)=5\)
\(\Leftrightarrow x=5-1\)
\(\Leftrightarrow x=4\)
\(\left[\left(-x\right)^3\right]^4=\left(-x\right)^{12}\)
\(\left(\dfrac{-1}{2}\right)^8\times2^3=\dfrac{1}{256}\times8=\dfrac{1}{32}\)
1) \(\left[\left(-x\right)^3\right]^4=\left(-x\right)^{12}=x^{12}\)
2) \(\left(-\dfrac{1}{2}\right)^8\cdot2^3=\dfrac{1}{256}\cdot8=\dfrac{1}{32}\)
a) 10 - x : 2 = 1
x: 2 = 9
x = 18
b) x:4 + 3 x 2 = 7
x:4 + 6 = 7
x:4 = 1
x = 4
c) 2: x + 5 = 6
2: x = 1
x = 2
+4.10-x:2=1
40-x:2=1
x:2=40-1
x:2=39
x:2=19,5
+5.x:4+3*2=7
5.x:4+6=7
5.x:4=7-6=1
5.x=1.4=4
x=4:5
x=0,8
+6.2:x+5=6
12:x=6-5
12:x=1
x=12:1
x=12
+7.2*x*3*5=30
14.x.15=30
14.x=2
x=2:14
x=1/7
+8.2*x:10*2=1
16.x:20=1
16.x=20
x=20:16
x=1,25
9.18:x-5*2=8
10.5*5-2:x=24
\(4) 10-x:2=1 \)
\(=> x:2=10-1\)
\(=> x:2=9\)
\(=> x=9.2\)
\(=> x=18\). Vậy \(x=18\)
\(5) x:4+3.2=7\)
\(=> x:4+6=7\)
\(=> x:4=7-6\)
\(=> x:4=1\)
\(=> x=4\). Vậy \(x=4\)
\(6) 2:x+5=6\)
\(=> 2:x=6-5\)
\(=> 2:x=1\)
\(=> x=2\).Vậy \(x=2\)
\(7) 2.x.3.5=30\)
\(=> 2x.15=30\)
\(=>2x=30:15\)
\(=> 2x=2\)
\(=> x=1\).Vậy \(x=1\)
\(8)2.x:10.2=1\)
\(=> 2x=1:2.10\)
\(=> 2x=5\)
\(=>x=5:2\)
\(=> x=\frac{5}{2}\).Vậy \(x=\frac{5}{2}\)
\(9)18:x-5.2=8\)
\(=> 18:x-10=8\)
\(=>18:x=8+10\)
\(=>18:x=18\)
\(=> x=1\).Vậy \(x=1\)
\(10)5.5-2:x=24\)
\(=>25-2:x=24\)
\(=> 2:x=25-24\)
\(=>2:x=1\)
\(=>x=2\).Vậy \(x=2\)
a)
57 . 257 và 6255
Ta có:
57 . 257 = 1257 =( 53 )7 = 53.7 = 521
6255 = ( 54 )5 =54.5 = 520
Vì 521 > 520 => 57 . 257 > 6255
Vậy 57 . 257 > 6255
b) ( 34 )4 và ( 32 )6
Ta có:
( 34 )4 = 34.4 = 316
( 32 )6 = 32.6 = 312
Vì 316 > 312 => ( 34 )4 > ( 32 )6
Vậy ( 34 )4 > ( 32 )6
c) 8 . 24 và 29
Ta có:
8 . 24 = 23 . 24 = 27
Vì 27 < 29 => 8 . 24 < 29
Vậy 8 . 24 < 29
Học tốt!!!
5^x-2-3^2=16-(2^12-2^12)
5^x-2-3^2=16-0
5^x-2-3^2=16
5^x-2-9=16
5^x-2=16+9
5^x-2=25
5^x-2=5^2
x-2=2
suy ra x=4
\(5^{x-2}-3^2=2^4-\left(2^8.2^4-2^{10}.2^2\right)\)
\(5^x\div5^2-9=16-\left(2^{12}-2^{12}\right)\)
\(5^x\div25-9=16\)
\(5^x\div25=16+9\)
\(5^x\div25=25\)
\(5^x=25.25\)
\(5^x=625\)
\(5^x=5^4\)
\(\Rightarrow x=4\)