tìm x: 2 x X x 3 - 110 = 710
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− 6 5 − 2 3 − − 7 15 ≤ x ≤ 1 10 + 4 5 − − 7 10 − 18 15 + − 10 15 + 7 15 ≤ x ≤ 1 10 + 8 10 + 7 10 − 7 5 ≤ x ≤ 16 10 ⇒ x = − 1 ; 0 ; 1
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a) (3x - 1)³ + 17 = 710 : 5
(3x - 1)³ + 17 = 142
(3x - 1)³ = 142 - 17
(3x - 1)³ = 125
(3x - 1)³ = 5³
3x - 1 = 5
3x = 5 + 1
3x = 6
x = 6 : 3
x = 2
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a ) x = 5 12 x = − 5 12 b ) x = 89 14 x = 23 14
c ) x = 69 20 x = − 49 20 d ) x = 22 9 x = − 8 9
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(x + 1) + (x + 2) + (x + 3) + .... + (x + 100) = 5750
=> 100x + (1 + 2 + 3 + ... + 100) = 5750
=> 100x + 5050 = 5750
=> 100x = 5750 - 5050
=> 100x = 700
=> x = 700 : 100
=> x = 7
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Các số tròn trăm lớn hơn 560 và nhỏ hơn 710 là: 600; 700
Vậy x bằng: 600; 700
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\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+10\right)=110\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+10\right)=110\)
\(\left(x+x+x+...+x\right)+55=110\)
\(11x=110-55\)
\(11x=55\)
\(x=55:11\)
\(x=5\)
2x X x3-110=710
=>(2x3)x X+ 110=710
=>6x X=710-110
=>6x X=600
=> X=600: 6
=>X=100
2xXx3-110=710
2xXx3=710+110
2xXx3=820
6xX=820
X=820:6
X=\(\frac{410}{3}\)