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\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{435}\\{352}\end{array}}\\\hline{\,\,\,787}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{236}\\{528}\end{array}}\\\hline{\,\,\,\,764}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{354}\\{\,\,\,63}\end{array}}\\\hline{\,\,\,\,417}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{569}\\{426}\end{array}}\\\hline{\,\,\,\,143}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{753}\\{236}\end{array}}\\\hline{\,\,\,517}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{880}\\{\,\,54}\end{array}}\\\hline{\,\,\,826}\end{array}\)
Có 12 số số hạng
=> Có 6 cặp
(44-40)+(36-32)+(28-24)+(20-16)+(12-8)+(4-0)
= 4+4+4+4+4+4
= 6 x 4=24
44-40+36-32+28-24+20-16+12-8+4-0
= ( 36 + 4 - 40 ) + ( 28 + 12 - 32 - 8 ) + ( 44 - 24 - 16 ) + 20 - 0
= 0 + 0 + 4 + 20 - 0
= 24
44-40+36-32+28-24+20-16+12-8+4-0=4+4+4+4+4+4=4x6=24
(44 - 24) + (40 - 20) +(36 - 16) + (32 - 12) + (28 - 8) + 4 - 0
=20 + 20 + 20 + 20 + 20 + 4
= 104
-Tk cho mk nha-
-Mk cảm ơn-