\(\frac{6}{4}\cdot\frac{19}{10}-\frac{3}{4}\cdot\frac{7}{10}+\frac{3}{4}:\frac{10}{69}=2^{ }_{ }\)\(\frac{15}{46}\)
2/15/46
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\(\frac{6}{4}\times\frac{19}{10}-\frac{3}{4}\times\frac{7}{10}+\frac{3}{4}:\frac{10}{69}=\frac{3}{4}\times2\times\frac{19}{10}-\frac{3}{4}\times\frac{7}{10}+\frac{3}{4}\times\frac{69}{10}=\frac{3}{4}\times\frac{38}{10}-\frac{3}{4}\times\frac{7}{10}+\frac{3}{4}\times\frac{69}{10}=\frac{3}{4}\times\left(\frac{38}{10}-\frac{7}{10}+\frac{69}{10}\right)=\frac{3}{4}\times10=\frac{15}{2}\)
6/4 * 19/10 - 3/4 * 7/10 + 3/4 : 10/69
= 3/4 * 2 * 19/10 - 3/4 * 7/10 +3/4 : 10/69
= 3/4 * 38/10 - 3/4 * 7/10 + 3/4 * 69/10
= 3/4 * ( 38/10 - 7/10 + 69/10 )
= 3/4 * 100/10
= 3/4 * 10
= 30/4
