Question

Rezolvați ecuațile:
a)x+1,3=2,5
b)2,87–x=1,07
c)3x+10,25=17,75
d)2x–7,51=12,25
e)4x+45,7=98,2
f)2,1•x–0,3=2,22
g)15·3,5•x=4,5

Answer 1

a) x+1,3 = 2,5
x = 2,5-1,3
x = 1,2.

b) 2,87-x = 1,07
-x = 1,07-2,87
-x = -1,8 /•(-1)
x = 1,8.

c) 3x+10,25 = 17,75
3x = 17,75-10,25
3x = 7,5
x = 7,5/3
x = 2,5.

d) 2x-7,51 = 12,25
2x = 12,25+7,51
2x = 19,76
x = 19,76/2
x = 9,88.

e) 4x+45,7 = 98,2
4x = 98,2-45,7
4x = 52,5
x = 52,5/4
x = 13,125.

f) 2,1x-0,3 = 2,22
2,1x = 2,22+0,3
2,1x = 2,52
x = 2,52/2,1
x = 1,2.

g) 15•3,5x = 4,5
52,5x = 4,5
x = 4,5/52,5
x = 0,085.




J'espère aidé :)

Answer 2

a) x+1,3=2,5
x=2,5-1,3=>1,2
B)2,87-x=1,07
x=2,87-1,07=>1,80
C)3x+10,25=17,75
3x=17,75-10,25=>3x=7,50=>x=7,50:3=2,50
D)2x-7,51=12,25
2x=12,25+7,51=>19,76=2x=19,76:2=9,88
E)4x+45,7=98,2
4x=98,2-45,7=>52,5=>x=52,5:4=13,1(2)
F)2,1•x-0,3=2,22
x=2,1x=2,22+0,3=>2,1x=2,52=>2,52:2,1=1,2

Pe G nu nil știu!
Sper că te-am ajutat!