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320 − 306 : 6;
536 : (68 : 17);
610 − 497 : 7 + 48;
(150 − 125 : 5) * 8;
(700 − 285 : 3 * 4) : 2;
27 * (840 : 7 − 19 * 6).

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ГДЗ учебник по математике 4 класс Дорофеев. Часть 1 страница 78. Номер №6

320 − 306 : 6 = 320 − 51 = 269;

\begin{matrix} \begin{array}{l} \underline{} 306 \\ \underline{30} \\ \underline{} 6 \\ \underline{6} \\ 0 \end{array} & \begin{array}{l} 6 \\ \bar{51} \end{array} \end{matrix}

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 320 \\ 51 \end{array} \\ \begin{array}{r} 269 \end{array} \end{array}

536 : (68 : 17) = 536 : 4 = 134;

\begin{matrix} \begin{array}{l} \underline{} 536 \\ \underline{4} \\ \underline{} 13 \\ \underline{12} \\ \underline{} 16 \\ \underline{16} \\ 0 \end{array} & \begin{array}{l} 4 \\ \bar{134} \end{array} \end{matrix}

610 − 497 : 7 + 48 = 610 − 71 + 48 = 539 + 48 = 587;

\begin{matrix} \begin{array}{l} \underline{} 497 \\ \underline{49} \\ \underline{} 7 \\ \underline{7} \\ 0 \end{array} & \begin{array}{l} 7 \\ \bar{71} \end{array} \end{matrix}

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 610 \\ 71 \end{array} \\ \begin{array}{r} 539 \end{array} \end{array}

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 539 \\ 48 \end{array} \\ \begin{array}{r} 587 \end{array} \end{array}

(150 − 125 : 5) * 8 = (150 − 25) * 8 = 125 * 8 = 1000;

\begin{matrix} \begin{array}{l} \underline{} 125 \\ \underline{10} \\ \underline{} 25 \\ \underline{25} \\ 0 \end{array} & \begin{array}{l} 5 \\ \bar{25} \end{array} \end{matrix}

\begin{array}{r} \times \underline{\begin{array}{r} 125 \\ 8 \end{array}} \\ 1000 \end{array}

(700 − 285 : 3 * 4) : 2 = (700 − 95 * 4) : 2 = (700 − 380) : 2 = 320 : 2 = 160;

\begin{matrix} \begin{array}{l} \underline{} 285 \\ \underline{27} \\ \underline{} 15 \\ \underline{15} \\ 0 \end{array} & \begin{array}{l} 3 \\ \bar{95} \end{array} \end{matrix}

\begin{array}{r} \times \underline{\begin{array}{r} 95 \\ 4 \end{array}} \\ 380 \end{array}

\begin{array}{r} \begin{array}{r} - \end{array} \begin{array}{r} 700 \\ 380 \end{array} \\ \begin{array}{r} 320 \end{array} \end{array}

\begin{matrix} \begin{array}{l} \underline{} 320 \\ \underline{2} \\ \underline{} 12 \\ \underline{12} \\ \underline{} 0 \\ \underline{0} \\ 0 \end{array} & \begin{array}{l} 2 \\ \bar{160} \end{array} \end{matrix}

27 * (840 : 7 − 19 * 6) = 27 * (120 − 114) = 27 * 6 = 162.

\begin{matrix} \begin{array}{l} \underline{} 840 \\ \underline{7} \\ \underline{} 14 \\ \underline{14} \\ \underline{} 0 \\ \underline{0} \\ 0 \end{array} & \begin{array}{l} 7 \\ \bar{120} \end{array} \end{matrix}

\begin{array}{r} \times \underline{\begin{array}{r} 19 \\ 6 \end{array}} \\ 114 \end{array}

\begin{array}{r} \times \underline{\begin{array}{r} 27 \\ 6 \end{array}} \\ 162 \end{array}

ГДЗ Математика 4 класс Дорофеев, Миракова, Бука, 2015