Question

tìm x

/x+\(\frac{4}{15}\)/ \(-\)/ -3,75 / = - /2,15/

Answer 1

/x + \(\frac{4}{15}\)/ - 3,75 = -2,15

=> /x + \(\frac{4}{15}\)/ = 1,6

=> \(x+\frac{4}{5}=1,6\) hoặc \(x+\frac{4}{5}=-1,6\)

=> \(x=0,8\)hoặc \(x=-2,4\)

Answer 2

c) 22/5 + 51/9 + 11/4 + 3/5 + 1/3 + 1/4
= 22/5 +3/5 +51/9 + 1/3 +11/4+1/4
= (22/5 +3/5) +(51/9 + 3/9) +(11/4+1/4)
= 25/5 +54/9 +12/4
= 5 +6 +3
= 14
d) (1/6 + 1/10 + 1/15) : (1/6 + 1/10 - 1/15) 
= (5/30 + 3/30 +2/30 ) :(5/30 +3/30 -2/30)
= 10/30 : 6/30
= 1/3 : 1/5
= 5/3