Calculati: a)2ori(3la puterea 3+x:2)=5ori4²; b)4ori(5²+x:3)=7ori2 la puterea 4;
c)5ori(2la puterea4+x:5)=2ori3la puterea3; d)2ori(4:x+7²):2=7ori2²;
e)(40:x+8²):3=3ori2la puterea 3; f)3ori(x+5)=2ori(x+10); g)5ori(x-2)=3ori(x+4);
j)5ori(2x-5)5=7ori(x+3)-19

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Răspunsuri

2014-11-15T11:25:30+02:00
A) 2ori(27+x:2)=5ori16
54+x=80
x=80-54=26
b) 4ori(25+x:3)=7 ori 16
100+4x:3=112
4x:3=112=100
4x:3=12
4x=12ori3
4x=36
x=9
c)5ori(16+x:5)=2ori27
80+x=52
x=52-80=-28
d)2ori(4:x+49):2=7ori4
4:x+49=28
4:x=28-49
4:x=-11
x=4:(-11)

e)(40:x+64):3=3ori8
40:x+64=3ori8ori3
40:x+64=72
40:x=8
x=40:8=5
f)3x+15=2x+20
3x-2x=20-15
x=5
g)5x-10=3x+12
5x-3x=12+10
2x=22
x=11
j)50x-125=7x+21-19
50x-7x=2+125
43x=127
x=127:43