Вычислите (31.18--31.19). Created by milanaveselova014. algebra-ru

Вычислите (31.18--31.19)...

milanaveselova014 @milanaveselova014

September 2021 1 39 Report

Вычислите (31.18--31.19)

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medcentrekon

Відповідь:

$\frac{38^{2}-28^{2} }{47^{2}-19^{2}} =\frac{2^{2}*19^{2}-2^{2}*14^{2}}{47^{2}-19^{2}} =\frac{2^{2}(19^{2}-14^{2})}{47^{2}-19^{2}} =\frac{4*165}{2209-361} =660:1848=\frac{165}{462}$

$\frac{53^{2}-25^{2}}{79^{2}-51^{2}} =\frac{2809-625}{6241-2601} =\frac{2184}{3640} =\frac{273}{455} =0,6$

$\frac{181^{2}-61^{2}}{319^{2}-77^{2}} =\frac{32761-3721}{101761-5929} =\frac{29040}{95832} =\frac{3630}{11979}$

$\frac{200^{2}-380^{2}}{420^{2}-160^{2}} =\frac{40000-144400}{176400-25600} =\frac{-104400}{150800} =\frac{-1044}{1508} =-\frac{261}{377}$

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