Question

Rezolvati in Q+ ecuatiile
a) 2/5 x=4/15
b) x+3/4=5/6
c) x:1 5/6=9/22
d)21/16:x=7/8
e) x-7/10=3/8
f)5/3-x=3/4
Dau coroana

Answer 1

a) 2/5 x=4/15=>(5*2x)/(2*5)=(5*4)/(2*15)=>x=(5*4)/(2*15)=>x=2/3

b)x+3/4=5/6=>(4x+3)/4=5/6=>4x+3=(4*5)/6=>4x+3=10/3=>4x=10/3-3=>
4x=(10-9)/3=>4x=1/3=>x=1/12

c)x/1*5/6=9/22=>(6*5x)/(5*6)=(6*9)/(5*22)=>x=(3*9)/(5*11)=>x=27/55
d)21/16/x=7/8=>(21x)/16=7/8=>(16*21x)(21*16)=(16*7)/(21*8)=>
x=(2*7)/21=>x=2/3
e)x-7/10=3/8=>10(x-7)/10=(10*3)/8=>x-7=15/4=>x=15/4+7=>x=15/4+28/4=>
x=43/4
f)5/3-x=3/4=>(3-x)/5=4/3=>3-x=20/3=>-x=11/3=>x=-11/3