помогите с тенировочным заданием . Created by top5anime1111. algebra-ru

помогите с тенировочным заданием ...

ildar502020

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$5)\ \ \displaystyle \frac{75}{26}\cdot \frac{13}{15}=\frac{5\cdot 1}{2\cdot 1}=\frac{5}{2}=2\frac{1}{2}=2,5\\\\\\6)\ \ \frac{1}{1+\frac{1}{4}}=\frac{1}{\frac{5}{4}}=\frac{4}{5}=0,8\\\\\\7)\ \ \frac{1}{\frac{1}{33}+\frac{1}{12}}=\frac{1}{\frac{15}{132}}=8\frac{12}{15}=\frac{132}{15}=8,8$

$8)\ \ \displaystyle \Big(\frac{5}{6}+\frac{11}{10}\Big)\cdot 24=\frac{25+33}{30}\cdot 24=\frac{58}{5}\cdot 4=\frac{232}{5}=46\frac{2}{5}=46,4\\\\\\9)\ \ \Big(\frac{19}{25}-\frac{7}{13}\Big)\cdot \frac{13}{12}=\frac{72}{13\cdot 25}\cdot \frac{13}{12}=\frac{6}{25}=0,24\\\\\\10)\ \ \Big(\frac{11}{30}-\frac{17}{36}\Big):\frac{19}{45}=-\frac{19}{180}\cdot \frac{45}{19}=-\frac{45}{180}=-\frac{1}{4}=-0,25$

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NNNLLL54

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Объяснение:

5. 75/26 * (13/15) =75*13/26*15=5/2=2,5;

6. 1/(1 + 1/4)=1:5/4 =4/5=0.8;

7. 1/(1/33+1/12)=1 : 5/44=44/5=8 4/5=8.8;

8. (5/6+11/10)*24= (50/60+66/60)= 116/60*24= 29/15*24=232/5=46.4;

9. (19/25-7/13)*13/12=72/325*13/12=6/25=0.24;

10. (11/30-17/36):19/45= (66/180-85/180):19/45= -19/180*45/19=-1/4=-0.25.

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