Câu 1: Tính giá trị biểu thức: A) 27.36 + 64.27 B) 125. (-7). (-5).8 C) 134 + 66 + (-95) + 46 + (-105) D) (-124) + (-36) + (-56) + (-135) E) 35 + 45 - (54 + 47 - 35 - 34)

$A)$ $\:27.36\:+\:64.27\:\:$

$=27\left(36+64\right)$

$=27\cdot \:100$

$=2700$

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$B)$ $125\cdot \left(-7\right)\cdot \left(-5\right)\cdot 8\:$

$=\left(125\cdot \:8\right)\:\left[\left(-7\right).\:\left(-5\right)\:\right]$

$=125\cdot \:8\cdot \:7\cdot \:5$

$=35000$

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$C)$ $134\:+\:66\:+\:\left(-95\right)\:+\:46\:+\:\left(-105\right)\:\:\:\:\:\:$

$=\left(\:134\:+\:66\:+\:\:46\right)+\:\left[\left(-95\right)\:+\:\left(-105\right)\:\:\:\right]\:\:\:\:\:$

$=246-200$

$=46$

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$D)$ $\left(-124\right)\:+\:\left(-36\right)\:+\:\left(-56\right)\:+\:\left(-135\right)\:\:\:$

$=\left[\left(-124\right)\:+\:\left(-135\right)\right]\:+\:\:\left[\left(-36\right)\:+\:\left(-56\right)\:\right]$

$=-259-92$

$=-351$

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$E)$ $35\:+\:45\:-\:\left(54\:+\:47\:-\:35\:-\:34\right)$

$=\left(35\:+\:45\right)\:-\:\left(\left(54\:+\:47\right)\:-\:\left(35\:-\:34\right)\right)$

$=\left(35+45\right)-\left(101-1\right)$

$=80-100$

$=-20$