\( \displaystyle A = 27 + 46 + 79 + 34 + 53 \)\( \displaystyle = (27 + 53) + (46 + 34) + 79 \)\( \displaystyle = 80 + 80 + 79 = 239\)
\( \displaystyle B = - 377 - (98 - 277)\)
\( \displaystyle = - 377 - 98 + 277\)
\( \displaystyle = - 475 + 277\)
\( \displaystyle = - (475 - 277)\)
\( \displaystyle = -198\)
\( \displaystyle C = - 1,7× 2,3 + 1,7.× (- 3,7)\)\( \displaystyle - 1,7×3 - 0,17:0,1\)
\( \displaystyle = - 1,7× 2,3 + 1,7.× (- 3,7) \)\( \displaystyle - 1,7×3 - 0,17.10\)
\( \displaystyle = - 1,7× 2,3 + 1,7.× (- 3,7)\)\( \displaystyle - 1,7×3 - 1,7\)
\( \displaystyle = 1,7. (-2,3 – 3,7 – 3 – 1)\)
\( \displaystyle = 1,7 . (-10) \)
\( \displaystyle = -17.\)
\( \displaystyle D=2{3 \over 4}.\left( { - 0,4} \right) - 1{3 \over 5}.2,75 \)\(\displaystyle + \left( { - 1,2} \right):{4 \over {11}}\)
\( \displaystyle ={{11} \over 4}.{{ - 4} \over {10}} - {8 \over 5}.{{11} \over 4} + {{ - 6} \over 5}.{{11} \over 4}\)
\( \displaystyle ={{11} \over 4}.\left( {{{ - 4} \over {10}} - {8 \over 5} + {{ - 6} \over 5}} \right)\)
\( \displaystyle = {{11} \over 4}.{{ - 2 - 8 - 6} \over 5}\)
\( \displaystyle = {{11} \over 4}.{{ - 16} \over 5}\)
\( \displaystyle = {{ - 44} \over 5}\)
\( \displaystyle E = {{\left( {{2^3}.5.7} \right)\left( {{5^2}{{.7}^3}} \right)} \over {{{\left( {{{2.5.7}^2}} \right)}^2}}}\)
\( \displaystyle = {{{2^3}{{.5}^3}{{.7}^4}} \over {{2^2}{{.5}^2}{{.7}^4}}}\)
\( \displaystyle = 2.5\)
\( \displaystyle = 10\)
