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a) sa se afle x din propozitiile
x/0,5=0,7/0,35
b)1/2+1/5/x=7/10
c)x/16=0,75+1/4/8


Răspuns :

x/0,5 = 0,7/0,35
x = 0,5 * 0,7 : 0,35 = 1
b) 1/2 + 1/5 /x = 7/10
5/10 + 2x/10 = 7/10
2x/10 = 7/10 - 5/10
2x = 2
x = 1
c) x/16 = 0,75 + 1/4 /8
x/16 = 75/100 + 1/4 * 1/8
x/16 = 3/4 + 1/32
2x/32 = 24/32 + 1/32
2x = 25
x = 25 : 2
x = 12,5