Question

a) x – 36 : 18 = 12 – 15

b) 92 – (17 + x) = 72

c) 720 : [41 – (2x + 5)] = 40

d) (x + 2)3 - 23 = 41

Answer 1

\(a,x-36:18=12-15\\ \Rightarrow x-2=-3\\ \Rightarrow x=-1\\ b,92-\left(17+x\right)=72\\ \Rightarrow17+x=20\\ \Rightarrow x=3\\ c,720:\left[41-\left(2x+5\right)\right]=40\\ \Rightarrow41-\left(2x+5\right)=18\\ \Rightarrow2x+5=23\\ \Rightarrow2x=18\\ \Rightarrow x=9\\ d,\left(x+2\right)^3-23=41\\ \Rightarrow\left(x+2\right)^3=64\\ \Rightarrow\left(x+2\right)^3=4^3\\ \Rightarrow x+2=4\\ \Rightarrow x=2\)

Answer 2

b: =>x+17=20

hay x=3

d: =>x+2=4

hay x=2

Answer 3

A = 1
B = 3
C = 9
D = 2