x+4/5=2x5/3
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(2 ^ 2 + 1) x (2 ^ 2 - 1) x (2 ^ 4 - 4 ^ 2)
= (2 ^ 2 + 1) x (2 ^ 2 - 1) x ( 16 - 16 )
= (2 ^ 2 + 1) x (2 ^ 2 - 1) x 0
= 0
( 7 ^ 3 + 7 ^ 5) x (5 ^ 4 + 5 ^ 6) x ( 3 ^ 3 x 3 - 9 ^ 2)
= ( 7 ^ 3 + 7 ^ 5) x (5 ^ 4 + 5 ^ 6) x ( 3 ^ 4 - 3 ^ 4)
= ( 7 ^ 3 + 7 ^ 5) x (5 ^ 4 + 5 ^ 6) x 0
= 0
2 ^ 2 x 5 [( 5 ^ 2 + 2 ^ 3) : 11] - 2 ^ 4 + 2 x 10 ^ 3
= 4 x 5 [( 25 + 8 ) : 11] - 8 + 2 x 1000
= 20 ( 33 : 11) - 8 + 2000
= 20 x 3 - 8 + 2000
= 60 - 8 + 2000
= 2052
\(a)4(15-18)-(3-5).(-3)^2\)
\(=4.\left(-3\right)-2.9\)
\(=6\)
\(b)(-4-11):(-3)\)
\(=-15:\left(-3\right)\)
\(=5\)
\(c)143-(-57)-(-2)^3.(-3)^0\)
\(=143+57+8.1\)
\(=208\)
\(d,\left(-5\right).\left[\left(90-2.5\right)-10^2+10:\left|-2\right|\right]\)
\(=-5.\left[80-100+10:2\right]\)
\(=-5.-15\)
\(=75\)
\(\Leftrightarrow220+16+x-5=64.5=320\\ \Leftrightarrow231+x=320\\ \Leftrightarrow x=89\)
52x-3 - 2x52 = 52 x 3
52x-3 - 2x52 = 75
52x-3 - 50 = 75
52x-3 = 75 +50
52x-3 = 125 = 53
=> 2x - 3 = 3
=> 2x = 3+3
=> 2x = 6
=>x = 6:2
=> x = 3
tick nhé
6 x5/3=10 7:8/4+1/3=23/6 2x5/8-1/2=3/4 3/7:5/6x1/4=9/70
\(x+\dfrac{4}{5}=2x\dfrac{5}{3}\)
<=> \(x+\dfrac{4}{5}=\dfrac{6x+5}{3}\)
<=> \(\dfrac{15x}{15}+\dfrac{12}{15}=\dfrac{5\left(6x+5\right)}{15}\)
<=> 15x + 12 = 5(6x + 5)
<=> 15x + 12 = 30x + 25
<=> 15x - 30x = 25 - 12
<=> -15x = 13
<=> x = \(\dfrac{-13}{15}\)