Question

[Nguyễn Tuyết Mai]

Tìm x

720 : [41-(2x-5)] =2^3 . 5

2^x = 15 = 17

(7x-11)^3= 2^5.5^2+200

Answer 1

[Kunzy Nguyễn]

720 : [41-(2x-5)] =2^3 . 5

<=> 41-(2x-5)=720:40=18

<=> 2x-5=41-18=23

<=>2x=23+5=28

<=> x=28:2=14

2^x-15=17

<=> 2^x=17+15=32

<=> 2^x=2^5

<=> x=5

(7x-11)^3= 2^5.5^2+200

<=> (7x-11)^3=1000

<=> (7x-11)^3=10^3

<=> 7x-11=10

<=> 7x=10+11=21

<=> x=21:7=3

Answer 2

[Nguyễn Tuyết Mai]

2^x-15=17 nhe. Minh viet nham