Tìm số nguyên x, biết:
a) 56: x+ 23= 37
b) 122- 4* ( x-1)= (-34)+ 64
c) (2x+1)^2= 108:4
d) (/x/-3): 2= 3^2=5^2
Tìm số nguyên x, biết: a) 56: x+ 23= 37 b) 122- 4* ( x-1)= (-34)+ 64 c) (2x+1)^2= 108:4 d) (/x/-3): 2= 3^2=5^2
By Reese
By Reese
Tìm số nguyên x, biết:
a) 56: x+ 23= 37
b) 122- 4* ( x-1)= (-34)+ 64
c) (2x+1)^2= 108:4
d) (/x/-3): 2= 3^2=5^2
a) `56 : x + 23 = 37`
`⇒ 56 : x = 37 – 23`
`⇒ 56 : x = 14`
`⇒ x = 56 : 14`
`⇒ x = 4`
b) `122 – 4. (x – 1) = (-34) + 64`
`⇒ 122 – 4. (x – 1) = 30`
`⇒ 4. (x – 1) = 122 – 30`
`⇒ 4. (x – 1) = 92`
`⇒ x – 1 = 92 : 4`
`⇒ x – 1 = 23`
`⇒ x = 24`
d) `(|x| – 3) : 2 = 3^2 + 5^2`
`⇒ (|x| – 3) : 2 = 9 + 25`
`⇒ (|x| – 3) : 2 = 34`
`⇒ |x| – 3 = 34. 2`
`⇒ |x| – 3 = 68`
`⇒ |x| = 71`
`⇒`\(\left[ \begin{array}{l}x=71\\x=-71\end{array} \right.\)
c) Sai đề
Đáp án:
a 56:x+23=37
56:x=37-23
56:x=14
x=56:14
x=4
b122-4.(x-1)=(-34)+64
122-4.(x-1)=30
4.(x-1)=122-30
4.(x-1)=92
x-1=92:4
x-1=23
x=24
c SAI ĐỀ
dSAI ĐỀ