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a fost răspuns

Aflati x∈N astfel incat:
a) 3(2x-1)=141;
b) 8x+10=6x+18;
c) 29-5(x+1)=4;
d) 2(3x-1)=3(x+2)+4;
e) [37-(x-1)·3]·2=14;
f) [(x-3)·2+7]:5=15.

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Răspuns :

a) 6x-3=141 6x=141+3 6x=144 x=144:6 x24 b)8x-6x=18-10 2x=8 x=4 c)29-5x-5=4 -5x=20 x=-4 d)6x-2=3x+6+4 6x-2=3x+10 6x-3x=10+2 3x=12 x=4 e)[37-(-x+1)•3]•2=14 (37+3x+3)•2=14 (40+3x)•2=14 80+6x=14 6x=14-80 6x=-66 x=-11 f) (2x-6+7):5=15 2x+1:5=15 2x+0,2=15 2x=15-0,2 2x=14,8 x=7,4 Am scris direct rezolvarile.

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