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Dau coroana! Urgent !a,b, c,d,e...urgent

Dau Coroana Urgent Ab Cdeurgent class=
Dau Coroana Urgent Ab Cdeurgent class=

Răspuns :

20-a
0.8x-2.8=3.9
0.8x=3.9+2.8
0.8x=6.7
x=8.375
20-b
0.1+x+0.2+2x+0.3+3x+0.4+4x=29
1+10x=29
10x=29-1
10x=28
x=28/10
x=14/5
c-
1.111+x=2.667
x=2.667-1.111
x=1.556
d--
90.1+2.2+3.3+4.4)x=1.1+9.9
x=/1.1+9.9/0.1+2.2+3.3+4.4
x=11/10
e--
3.25+1+4x=8.05
4.25+4x=8.05
4x=8.05-4.25
4x=3.8
x=0.95