Question

Afla valoarea lui a: a÷(2×3)=4,a÷(15_9)=9,(a÷6)+25=31,8×4+9×4=86,(20÷a+20)÷6=50÷10,20-5×a=5

Answer 1

a:(2x3)=4
a:6=4
=>a=6x4
=>a-24

a:(15-9)=9
=>a:6=9
=>a=6x9
=>a=54




(a:6)+25=31
=>a:6=31-25
=>a:6=6
=>a=6x6
=>a=36
 

8x4+9x4=86
=>32+36=86
=>68=86
=>86-68=18



(20:a+20):6=50:10
=>(20:a+20):6=5
=>20:a+20=30(5x6)
=>20:a=30-20
=>20:a=10
=>a=200(10x20)



20-5a=5
 =>5xa=20x5
=>5xa=100
=>a=100:5
=>a=20