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Calculati:
[tex] 6,5^{2} :[ \frac{5}{8} +(12,5-5) X(inmultit) \frac{2}{5} ]-3,75-2,75[/tex]


Răspuns :

6,5²:[5/8+(12,5-5)×2/5]-6,5=
=42,25:(5/8+7,5×2/5)-6,5=
=42,25:(5/8+3)-6,5=
=42,25:29/8-6,5=
=4225/100×8/29-65/10=
=169/4×8/29-13/2=
=338/29-13/2=
=(338*2-13*29)/58=
=(676-377)/58=
=299/58