Question

(1 1/7-23/49)*21/22
175 номер

Answer 1

$\tt\displaystyle (1\frac{1}{7}-\frac{23}{49})* \frac{21}{22}=(1\frac{1*7}{7*7}-\frac{23}{49})* \frac{21}{22}= (1\frac{7}{49}-\frac{23}{49})* \frac{21}{22}=\\\\\\=(\frac{56}{49}-\frac{23}{49})* \frac{21}{22}=\frac{33}{49} *\frac{21}{22}=\frac{3*3}{7*2} =\bold{\frac{9}{14}}$