Решите примеры:1) 2 1/3 : 21 + 1 1/2 * 2/32) 6/4 * 1/3 + 1 3/5 : ( 7/8 + 6/17). Created by Puma99. matematika-ru

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smileos

1) $2\frac{1}{3}:21+1\frac{1}{2}\cdot\frac{2}{3}=1\frac{1}{9}$

1) $2\frac{1}{3}:21=\frac{7}{3}:21=\frac{7}{3}\cdot\frac{1}{21}=\frac{1}{9}$

2) $1\frac{1}{2}\cdot\frac{2}{3}=\frac{3}{2}\cdot\frac{2}{3}=1$

3) $\frac{1}{9}+1=\frac{1+9}{9}=\frac{10}{9}=1\frac{1}{9}$

2) $\frac{6}{4}\cdot\frac{1}{3}+1\frac{3}{5}:(\frac{7}{8}+\frac{6}{17})=1\frac{1341}{1670}$

1) $\frac{7}{8}+\frac{6}{17}=\frac{119+48}{136}=\frac{167}{136}=1\frac{31}{136}$

2) $\frac{6}{4}\cdot\frac{1}{3}=\frac{1}{2}$

3) $1\frac{3}{5}:1\frac{31}{136}=\frac{8}{5}:\frac{167}{136}=\frac{8}{5}\cdot\frac{136}{167}=\frac{1088}{835}=1\frac{253}{167}$

4) $\frac{1}{2}+1\frac{253}{167}=\frac{1}{2}+\frac{1088}{835}=\frac{835+2176}{1670}=\frac{3011}{1670}=1\frac{1341}{1670}$

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