Question

Câu 2. Tìm số tự nhiên x, biết:

a)     a) 7x - 8 = 713                                                    

b)    b) 2448 : [119 - (x - 6)] = 24      

c)     c) 2016 – 100.(x + 11) = 2⁷ : 2³ 

Answer 1

a,

7x – 8 = 713

7x = 713 + 8

7x = 721

x = 721 : 7

x = 103.

Answer 2

b,

2448:[119-(x-6)]=24

119-(x-6)= 2448 : 24

119-(x-6)= 102

x-6= 119-102

x-6= 17

x=17+6

x=23

Answer 3

c,

2016 - 100.( x +11 ) = 2^7 : 2^3
2016 - 100.(x+11) = 2^4
2016 - 100.(x+11)=16
100.(x+11) = 2016-16
100.(x+11)=2000
x+11=2000:100
x+11=20
x = 20-11
x = 9

Answer 4

A,7x=713+8

7x=721

X=721÷7

X=103

B,2448÷[119-(x-6)]=24

119-(x-6)=2448÷24

119-(x-6)=102

X-6=119-102

X-6=12

X=12+6

X=18