Question

tim x biet,

5^x  + 5^x+2= 650

Thuc hien phep tinh

(1+2+3+4+...+90).(12.34 - 6.68) : (1/3+1/4+1/5+1/6)

Answer 1

ta có 5^x+5^x*25=650 suy ra 5^x *26=650 ,5^x=25 suy ra x=2

Answer 2

Mk giúp phần đầu nhé!

Có 5^x+5^x+2=650

=> 5^x.(1+5²)=650

     5^x. 26=650

     5^x=650:26

     5^x=25

=> x=2

Answer 3

12*34=1*68

=>12*34-6*68=0=>bieu thuc = 0

Answer 4

5^x+5^x+2=650

5^x.(1+5²)=650

5^x.26=650

5^x=650:26

5^x=25

5^x=5²

=>x=2

(1+2+3+.......+90).(12.34 - 6.68) : (1/3+1/4+1/5+1/6) 

=(1+2+3+.......+90).(6.2.34 - 6.68) : (1/3+1/4+1/5+1/6)

=(1+2+3+.......+90).(6.68 - 6.68): (1/3+1/4+1/5+1/6)

=(1+2+3+.......+90).0: (1/3+1/4+1/5+1/6)

=0: (1/3+1/4+1/5+1/6)=0