Toán Lớp 6: 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)
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Toán Lớp 6: 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)
Comments ( 2 )
$A)$ $\:27.36\:+\:64.27\:\:$
$=27\left(36+64\right)$
$=27\cdot \:100$
$=2700$
____________________________
$B)$ $125\cdot \left(-7\right)\cdot \left(-5\right)\cdot 8\:$
$=\left(125\cdot \:8\right)\:\left[\left(-7\right).\:\left(-5\right)\:\right]$
$=125\cdot \:8\cdot \:7\cdot \:5$
$=35000$
____________________________
$C)$ $134\:+\:66\:+\:\left(-95\right)\:+\:46\:+\:\left(-105\right)\:\:\:\:\:\:$
$=\left(\:134\:+\:66\:+\:\:46\right)+\:\left[\left(-95\right)\:+\:\left(-105\right)\:\:\:\right]\:\:\:\:\:$
$=246-200$
$=46$
____________________________
$D)$ $\left(-124\right)\:+\:\left(-36\right)\:+\:\left(-56\right)\:+\:\left(-135\right)\:\:\:$
$=\left[\left(-124\right)\:+\:\left(-135\right)\right]\:+\:\:\left[\left(-36\right)\:+\:\left(-56\right)\:\right]$
$=-259-92$
$=-351$
____________________________
$E)$ $35\:+\:45\:-\:\left(54\:+\:47\:-\:35\:-\:34\right)$
$=\left(35\:+\:45\right)\:-\:\left(\left(54\:+\:47\right)\:-\:\left(35\:-\:34\right)\right)$
$=\left(35+45\right)-\left(101-1\right)$
$=80-100$
$=-20$
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