Question

Rezolvati urmatoarele ecuatii, unde x este o fractie zecimala :

a) 49:7*x-13,2=14,8
b) (1,1+x)+(2,2+2x)+(3,3+3x)+(4,4+4x)=61
c) 24:4,8+x=456,7
d) (1+2+3+...+50)*x-123,4=3701,6
e) 5,75+0,5*8+3x=16,05

Answer 1

a) 7x - 13,2 = 14,8
7x = 14,8 +13,2
7x = 28
x= 28:7
x = 4
b) 2,1x + 4,2x + 9,3x + 16,4x = 61
32x = 61
X = 61:32
x = 1,90625
c) nu stiu
d)1275x - 123,4 = 3701,6
1275x = 3701,6 + 123,4
1275x = 3825: 1275
x= 3
e) 5,75 +4 +3x = 16,05
9,75 +3x = 16,05
3x = 16,05 - 9,75
3x = 6,3
x = 6,3:3
x = 2,1
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