80 Help ME Please 15 баллов) ...

July 2022 1 2 Report

Вычислите :
а) 1/65 + 7/130 - 9/13
б) 15/34 - 5/51 + 16/17
в) 17/36 + 13/12 + 11/18
г) 25/48 - 9/16 - 21/80
Help ME Please 15 баллов)

Answers & Comments

VekaSolnce $\frac{1}{65}+ \frac{7}{130} - \frac{9}{13} = \frac{2}{130}+ \frac{7}{130}- \frac{90}{130}= \frac{9}{130}-\frac{90}{130}=- \frac{81}{130};
 \\ \frac{15}{34}- \frac{5}{51}+ \frac{16}{17}=\frac{15}{2*17}- \frac{5}{3*17}+ \frac{16}{17}= \frac{45}{102} - \frac{10}{102}+ \frac{96}{102}= \frac{131}{102}= \\ =1 \frac{29}{102} ;$

$\frac{17}{36}+ \frac{13}{12} + \frac{11}{18}= \frac{17}{36}+ \frac{39}{36}+ \frac{22}{36}= \frac{78}{36}=2 \frac{6}{36}=2 \frac{1}{6} ; \\ 
 \frac{25}{48}- \frac{9}{16}- \frac{21}{80}= \frac{25}{3*16}- \frac{9}{16}- \frac{21}{16*5}= \frac{125}{240}- \frac{135}{240} - \frac{63}{240}= \\ 
= \frac{73}{240}$

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TheJaymun Спасибо)

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