Bai tim x
Cau 1 : 2^3.4^x.32^3=16^4.128^2
Cau 2 :2^x.4=128 ; cau 3 : x^15=x
Cau 4: 135+(x-55)=213 ; Cau 5: (2.x+1)^3=125
Cau 6: (x-5)^4=(x-5)^6 ; cau 7: (3.x-1)^2=25.9
Cau 8: 2^x+2^x+3=144 ; Cau 9: 5^x+5^x+2=650
Cau 10: 3^2.x+2=9^x+3
Cau 11: 39-x+(39:34-3^5-2^2.2^3):2=129
[giải nhanh đúng em cho hay nhất]
Cau1:
2^3.4^x.32^3=16^4.128^2
2^3.4^x.32.32.32=16.16.16.16.128.128
2^3.(2.2)^x.2^5.2^5.2^5=2^4.2^4.2^4.2^4.2^7.2^7
2^3.2^2.x.2^15=2^30
(2^3.2^15).2^2x=2^30
2^18.2^2x=2^30
suy ra18+2x=30
2x=30-18
2x=12
x=6
Cau 2
2^x.4=128
2^x.2^2=2^7
suy ra x+2=7
x=5
Cau 4
135+(x-55)=213
x-55 =213-135
x-55 =78
x=133
Cau 5
(2.x+1)^3=125
(2x+1)^3 =5^3
suy ra 2x+1=5
2x=4
x=2