Question

Bài 2: Tìm x, biết:
a) 75 - (x + 11) = 13

b) 29 + (x + 11) = 57
c) 11 + x : 5 = 13

d) 13 + 2(x + 1) = 15
e) 2x + 21 = 41

f) 12 + 3(x – 2) = 60
g) 24x – 11.13 = 11.11

h) 17 – (x – 4) : 2 = 3

Answer 1

c: Ta có: 11+x:5=13

\(\Leftrightarrow x:5=2\)

hay x=10

d: Ta có: \(13+2\left(x+1\right)=15\)

\(\Leftrightarrow2x+2=2\)

\(\Leftrightarrow2x=0\)

hay x=0

e: Ta có: 2x+21=41

\(\Leftrightarrow2x=20\)

hay x=10

f: Ta có: \(12+3\left(x-2\right)=60\)

\(\Leftrightarrow3\left(x-2\right)=48\)

\(\Leftrightarrow x-2=16\)

hay x=18

Answer 2

g: Ta có: \(24x-11\cdot13=11\cdot11\)

\(\Leftrightarrow24x=11\cdot24\)

hay x=11

h: Ta có: \(17-\left(x-4\right):2=3\)

\(\Leftrightarrow\left(x-4\right):2=14\)

\(\Leftrightarrow x-4=28\)

hay x=32