Toán Lớp 6: tính
9. (– 124) – (– 9). (– 76)
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Toán Lớp 6: tính
9. (– 124) – (– 9). (– 76)
Comments ( 2 )
C1)\\
9.{\rm{ }}\left( {-{\rm{ }}124} \right){\rm{ }}-{\rm{ }}\left( {-{\rm{ }}9} \right).{\rm{ }}\left( {-{\rm{ }}76} \right)\\
= 9.\left( { – 124} \right) + 9.\left( { – 76} \right)\\
= 9.\left( { – 124 – 76} \right)\\
= 9.\left( { – 200} \right)\\
= – 1800\\
C2)\\
9.{\rm{ }}\left( {-{\rm{ }}124} \right){\rm{ }}-{\rm{ }}\left( {-{\rm{ }}9} \right).{\rm{ }}\left( {-{\rm{ }}76} \right)\\
= – \left( {9.124} \right) – \left[ {\left( { – 9} \right).\left( { – 76} \right)} \right]\\
= – 1116 – 684\\
= – 1800
\end{array}\]