1) Tính
A ) ( – 14 ) + 5 +17 +14
B) ( -5 ) + ( -146 ) + ( -15 ) + 146
C) 40 + 13 + ( – 25 ) + (-13)
D ) 10 + 11 + ( – 25 ) + (- 11 )
E ) ( -2 ) + (-3) + 10 + ( -5 )
F) (123 – 37 ) – 123
G ) ( – 224 ) – ( 34 – 224 )
H ) 126 – ( 126 – 33 )
K ) (- 53 – 23 ) – ( 567 – 53 )
Đáp án:
Giải thích các bước giải:
A ) ( – 14 ) + 5 + 17 + 14
=[( – 14 ) + 14] + 5 + 17
=0 + 22
=22
B) ( -5 ) + ( -146 ) + ( -15 ) + 146
=[( – 146 ) + 146] + (-5) + (-15)
=0 + (-20)
=0 – 20
=(-20)
C) 40 + 13 + ( – 25 ) + (-13)
=[( – 13 ) + 13] + 40 + (-25)
=0 + 40 – 25
=0 + 15
=15
D ) 10 + 11 + ( – 25 ) + (- 11 )
=[( – 11 ) + 11] + 10 + (-25)
=0 + 10 – 25
=0 + (-15)
=0 – 15
=(-15)
E ) ( -2 ) + (-3) + 10 + ( -5 )
=[( – 3 ) + (-5)] + [10 + (-2)]
=(- 3 – 5) + (10 – 2)
=(-8) + 8
=0
F) (123 – 37 ) – 123
=123 – 37 – 123
=(123 – 123) – 37
=0 – 37
=(-37)
G ) ( – 224 ) – 34 – 224
= – 224 – 34 + 224
=(-224 + 224) – 34
=0 – 34
=(-34)
H ) 126 – ( 126 – 33 )
=126 – 126 + 33
=(126 – 126) + 33
=0 + 33
=33
K ) (- 53 – 23 ) – ( 567 – 53 )
=- 53 – 23 – 567 + 53
=(-53 + 53) – (23 + 567)
=0 – 590
=(-590)
A ) ( – 14 ) + 5 +17 +14
= ( – 14 + 14 ) + 5 + 17
= 0 + 22
= 22
B) ( -5 ) + ( -146 ) + ( -15 ) + 146
= – 146 + 146 + ( -5 ) + ( – 15 )
= ( – 146 + 146 ) + ( – 5 ) + ( – 15 )
= 0 + ( -20)
= – 20
C) 40 + 13 + ( – 25 ) + (-13)
= 13 + 40 + -25 + – 13
= ( 13 + – 13 ) + 40 + ( – 25 )
= 0 + 15
= 15
D ) 10 + 11 + ( – 25 ) + (- 11 )
= 11 + 10 + – 25 + – 11
= [ 11 + ( -11)] + 10 + ( – 25 )
= 0 + ( – 15)
= – 15
E ) ( -2 ) + (-3) + 10 + ( -5 )
= [ ( -2 ) + ( -3 ) + [ 10 + ( -5 ) ]
= ( -5) + 5
= 0
F) (123 – 37 ) – 123
= 123 – 37 – 123
=( 123 – 123 ) – 37
= 0 – 37
= – 37
G ) ( – 224 ) – ( 34 – 224 )
= – 224 – 34 + 224
= ( – 224 + 224 ) – 34
= 0 -34
= – 34
H ) 126 – ( 126 – 33 )
= 126 – 126 + 33
= ( 126 – 126 ) + 33
= 0 + 33
= 33
K ) (- 53 – 23 ) – ( 567 – 53 )
= – 53 – 23 – 567 + 53
= ( – 53 + 53 ) – 568 – 23
= 0 – 590
= – 590