Question

[Dang Huyen Trang]

( x - 1 ) mu 2 : 5 mu 21 = 25 mu 30 . 5        

2.3 mu x + 1 = 10.3 mu 12 + 8 : 27 mu 4   

( 19x + 2 .5 mu 2) : 14 = ( 13 - 8 ) mu 2 

1351 - 2 . ( x + 3) = 4 mu 12 : 8 mu 7 + 3

mong m.n giup mk vs !!!!

Answer 1

[Từ Thức 14]

(x-1)^2:5^21=25^30.5

(x-1)^2=25^30.5.5^21

           =(5^2)^30.5^22

           = 5^60.5^22

(x-1)^2 =5^82

(x-1)^2=(5^41)^2

x-1=5^41

x=5^41+1

2.3^x+1=10.3^12+8:3^12

2.3^x+1=10+8=18

3^x+1=18/2=9

3^x+1=3^2

x+1=2

x=1