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Sakalau300
a fost răspuns

Rezolvați ecuațiile a) 2x+ 4/7 = 4/3 b) 1,2 • x - 7=5

Răspuns :

a) 2x+4/7=4/3
    2x+12/21=28/21
    2x=28/21-12/21
    2x=16/21
    x=16/21:2
    x=16/21*1/2
    x=16/42
    x=8/21

b) 1,2*x-7=5
    1,2*x=7+5
    1,2*x=12
     x=12:1,2
     x=120:12
     x=10
[tex]a)2x+ \frac{4}{7}= \frac{4}{3} \\ 2x= \frac{4}{3} - \frac{4}{7} \\ 2x= \frac{28}{21} - \frac{12}{21}(N.C:21,am.amplificat.cu.7.si.cu.3) \\ 2x= \frac{16}{21} \\ x= \frac{16}{21} :2 \\ x= \frac{16}{21}* \frac{1}{2} \\ x= \frac{16}{42}= \frac{8}{21} \\ \\ b)1,2*x-7=5 \\ 1,2x-7=5 \\ 1,2x=5+7 \\ 1,2x=12 \\ x=12:1,2|*10 \\ x=120:12 \\ x=10 \\ \\ Sper \\ ca \\ te-am \\ ajutat! [/tex]

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