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)
2 câu trả lời
$A)$ $\:27.36\:+\:64.27\:\:$
$=27\left(36+64\right)$
$=27\cdot \:100$
$=2700$
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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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$E)$ $35\:+\:45\:-\:\left(54\:+\:47\:-\:35\:-\:34\right)$
$=\left(35\:+\:45\right)\:-\:\left(\left(54\:+\:47\right)\:-\:\left(35\:-\:34\right)\right)$
$=\left(35+45\right)-\left(101-1\right)$
$=80-100$
$=-20$
`a) 27 . 36 + 64 . 27`
`= 27 .(36 + 64)`
`= 27 . 100`
`= 2700`
`b)125 .(-7) . (-5) .8`
`= (125 . 8) . (-7) . (-5)`
`= 1000 . 35`
`= 35000`
`c) 134 + 66 + (-95) + 46 + (-105)`
`= 200 + [(-95) + (-105)] + 46`
`= 200 + -200 + 46`
`= 0 + 46`
`= 46`
`d) (-124) + (-36) + (-56) + (-135)`
`= (-160) + (-56) + (-135)`
`= -(116) + (-135)`
`= -351`
`e)` `35 + 45 - (54 + 47 - 35 - 34)`
`= 35 + 45 - 54 - 47 + 35 + 34`
`= 80 - 45 - 54 - 47 + 35 + 34`
`= 35 - 54 - 47 + 35 + 34`
`= -66 + 35 + 34`
`= 3`