Matematică, întrebare adresată de BigL12, 9 ani în urmă

5)Rezolvati in Q ecuatile:
a)3x=1 b)2x=10 c)5x=1/2 d)1/6x=7
e)2/9x=3/2 f)5x+6=7 g)4x+1=37
h)2/3x+1/2=6 i)7/5x+2=11/2 j)26/3x+2/3=25/12
k)2x-7=11 l) 3x-7=4

/ inseamna supra
MULTUMESC ANTICIPAT

Răspunsuri la întrebare

Răspuns de Utilizator anonim
1
A) 3x=1

x= \frac{1}{3}

B) 2x=10

x= \frac{10}{2}=5

C) 5x= \frac{1}{2}

x= \frac{1}{2}: 5= \frac{1}{2}· \frac{1}{5}= \frac{1}{10}

D) \frac{1}{6} x=7

x=7: \frac{1}{2}= 7· \frac{6}{1}=42

E) \frac{2}{9} x= \frac{3}{2}

x= \frac{3}{2}: \frac{2}{9}= \frac{3}{2}· \frac{9}{2}= \frac{27}{4}

F) 5x+6=7
5x=7-6
5x=1

x= \frac{1}{5}

G) 4x+1=37
4x=37-1
4x=36

x= \frac{36}{4}=9

H) \frac{2}{3} x+ \frac{1}{2}

\frac{2}{3} x=6- \frac{1}{2} (aducem la același numitor)

\frac{2}{3} x= \frac{12-1}{2}

\frac{2}{3} x= \frac{11}{2}

x= \frac{11}{2}: \frac{2}{3}

x= \frac{11}{2}· \frac{3}{2}

x= \frac{33}{4}

I) \frac{7}{5} x +2= \frac{11}{2}

\frac{7}{5} x= \frac{11}{2}-2 (aducem la același numitor)

\frac{7}{5} x= \frac{7}{2}

x= \frac{7}{2}: \frac{7}{5}

x= \frac{7}{2}· \frac{5}{7} (facem simplificarea)

x= \frac{5}{2}

J) \frac{26}{3} x+ \frac{25}{3}

\frac{26}{3} x= \frac{25}{12}- \frac{2}{3} (aducem la același numitor)

\frac{26}{3} x= \frac{17}{12}

x= \frac{17}{12}: \frac{26}{3}

x= \frac{17}{12}· \frac{3}{26}= \frac{51}{52}

K) 2x-7=11
2x=11+7
2x=18

x= \frac{18}{2}=9

L) 3x-7=4
3x=4+7
3x=11

x= \frac{11}{3}
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