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calculati:[5 2supra 3 +1(5)-2]:15 2supra3

Răspuns :

[5 2/3 + 1,(5)-2] : 15 2/3 =

= [(5×3+2)/3+(15-1)/9 - 2] : (15×3+2)/3 =

= (17/3 + 14/9 - 2) : 47/3 =

= [(3×17 + 14)/9 - 2] × 3/47 =

= [(51 +14)/9 - 2] × 3/47 =

= (65/9 - 2) × 3/47 =

= (65 - 2×9)/9 × 3/47 =

= (65-18)/9 × 3/47 =

= 47/9 × 3/47 =

= 3/9 =

= 1/3