Question

Bài 14. Tìm x biết:

a) x – 21,7 = 34,08                                b) x + 4,08 = 9,5

 

c) X x 3,6 = 84,24                    d) x : 1,8 = 3,06

 

Answer 1

\(a,x-21,7=34,08\\ \Rightarrow x=34,08+21,7\\ \Rightarrow x=55,78\\ b,x+4,08=9,5\\ \Rightarrow x=9,5-4,08\\ \Rightarrow x=5,42\\ c,x\times3,6=84,24\\ \Rightarrow x=84,24:3,6\\ \Rightarrow x=23,4\\ d,x:1,8=3,06\\ \Rightarrow x=3,06\times1,8\\ \Rightarrow x=5,508\)

Answer 2

a,x−21,7=34,08⇒x=34,08+21,7⇒x=55,78b,x+4,08=9,5⇒x=9,5−4,08⇒x=5,42c,x×3,6=84,24⇒x=84,24:3,6⇒x=23,4d,x:1,8=3,06⇒x=3,06×1,8⇒x=5,508

Answer 3

a , x − 21,7 = 34,08

     x = 34,08 + 21,7

     x = 55,78

b , x + 4,08 = 9,5

     x = 9,5 − 4,08

     x = 5,42

c , x × 3,6 = 84,24

     x = 84,24 : 3,6

     x = 23,4

d , x : 1,8 = 3,06

     x = 3,06 × 1,8

     x = 5,508