Toán Lớp 6: Bài 8: Bỏ dấu ngoặc rồi tính.
a) (123 – 27) + (27 + 13 – 123) b) (175 + 25 + 13) – (-15 + 175 + 25)
c) (2012 – 119 + 29) – (-119 + 29) d) – (55 – 80 + 91) – (2012 + 80 – 91)
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Toán Lớp 6: Bài 8: Bỏ dấu ngoặc rồi tính.
a) (123 – 27) + (27 + 13 – 123) b) (175 + 25 + 13) – (-15 + 175 + 25)
c) (2012 – 119 + 29) – (-119 + 29) d) – (55 – 80 + 91) – (2012 + 80 – 91)
Comments ( 2 )
$\text{*****7020}$
$ a) (123 – 27) + (27 + 13 – 123) = 123 – 27 + 27 + 13 – 123 = ( 123 – 123 ) + ( -27 + 27 ) + 13 = 13 $
$ b) (175 + 25 + 13) – (-15 + 175 + 25) = 175 + 25 + 13 + 15 – 175 – 25 = ( 175 – 175 ) + ( 25 – 25 ) + ( 13 + 15 ) = 28 $
$ c) (2012 – 119 + 29) – (-119 + 29) = 2012 – 119 + 29 + 119 – 29 = 2012 + ( -119 + 119 ) + ( 29-29)=2012 $
$ d) -(55-80+91)-(2012+80-91)=-55 + 80 – 91 – 2012 – 80 + 91 = ( -55 – 2012 ) + ( -80 + 80 ) + ( -91 + 91 )=-2067 $
Giải đáp + Lời giải và giải thích chi tiết:
a) (123 – 27) + (27 + 13 – 123)
= 123 – 27 + 27 + 13 – 123
= ( 123 – 123 ) – ( 27 – 27 ) + 13
= 0 – 0 + 13
= 0 + 13
= 13
b) (175 + 25 + 13) – (-15 + 175 + 25)
= 175 + 25 + 13 + 15 – 175 – 25
= ( 175 – 175 ) + ( 25 – 25 ) + ( 13 + 15 )
= 0 + 0 + 28
= 28
c) (2012 – 119 + 29) – (-119 + 29)
= 2012 – 119 + 29 + 119 – 29
= 2012 + ( 119 – 119 ) + ( 29 – 29 )
= 2012 + 0 + 0
= 2012
d) – (55 – 80 + 91) – (2012 + 80 – 91)
= -55 + 80 – 91 – 2012 – 80 + 91
= -55 + ( 80 – 80 ) – ( 91 – 91 ) – 2012
= -55 + 0 – 0 – 2012
= -55 – 2012
= -2067