Question

tim x , biet : 

a, ( 19 × x + 2.5² )  : 14 = ( 13 - 8 )²

b, 2.3^x = 10 . 3¹² + 8. 27⁴

^{ha oi giup mik}

Answer 1

a, ( 19.x + 2.5² )  : 14 = ( 13 - 8 )²

=> ( 19.x + 6,25 )  : 14 = 25

=> ( 19.x + 6,25  ) = 25 . 14

=> ( 19.x + 6,25 ) = 350

=> 19.x =  350 - 6,25

=> 19.x = 343,75

=> x = 343,75 : 19

=> x = ?

Answer 2

a) (19x + 50) : 14 = 9 nên x=4

b) 2.3^x = 10.3¹² + 8.3¹²

2.3^x = 3¹² (10 + 8) ; 2.3^x = 3¹².18

3^x = 3¹².3² ; 3^x = 3¹⁴ . Vậy x = 14

Answer 3

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