Tính:
\({\left( {{{ – 3} \over 4}} \right)^2};\,\,{\left( {{{ – 2} \over 5}} \right)^3};\,\,{\left( { – 0,5} \right)^2};\,\,{\left( { – 0,5} \right)^3};\,\,{\left( {9,7} \right)^0}\)
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\(\eqalign{& {\left( {{{ – 3} \over 4}} \right)^2} = {{{{\left( 3 \right)}^2}} \over {{4^2}}} = {9 \over {16}} \cr & {\left( {{{ – 2} \over 5}} \right)^3} = {{{{\left( { – 2} \right)}^3}} \over {{5^3}}} = {{ – 8} \over {125}} \cr& {\left( { – 0,5} \right)^2} = {\left( {{{ – 1} \over 2}} \right)^2} = {{{{\left( { – 1} \right)}^2}} \over {{2^2}}} = {1 \over 4} \cr & {\left( { – 0,5} \right)^3} = {\left( {{{ – 1} \over 2}} \right)^3} = {{{{\left( { – 1} \right)}^3}} \over {{2^3}}} = {{ – 1} \over 8} \cr & {\left( {9,7} \right)^0} = 1 \cr} \)
Mục lục môn Toán 8