Cộng và trừ số nguyên
Bài 1: Tính
a) 2763 + 152
b) ( – 7 ) + ( – 14 )
c) ( – 35 ) + ( – 9 )
d) ( – 5 ) + ( – 248 )
e) ( – 23 ) + 105
f) 78 + ( – 123 )
g) 23 + ( – 13 )
h) ( – 23 ) + 13
i) 26 + ( – 6 )
j) ( – 75 ) + 50
k) 80 + ( – 220 )
l) ( – 23 ) + ( – 13 )
m) ( – 26 ) + ( – 6 )
n) ( – 75 ) + ( – 50 )
Các bn giúp mk vs, lm đầy đủ các ý giúp mk nha. Cảm ơn các bn nhiều
Bài 1: Tính
a) 2763 + 152 = 2915
b) ( – 7 ) + ( – 14 ) = – (7 + 14) = -21
c) ( – 35 ) + ( – 9 ) = – (35 + 9) = -44
d) ( – 5 ) + ( – 248 ) = – (5 + 248) = -253
e) ( – 23 ) + 105 = 105 – 23 = 82
f) 78 + ( – 123 ) = – (123 – 78) = -45
g) 23 + ( – 13 ) = 23 – 13 = 10
h) ( – 23 ) + 13 = – (23 – 13) = -10
i) 26 + ( – 6 ) = 26 – 6 = 20
j) ( – 75 ) + 50 = – (75 – 50) = -25
k) 80 + ( – 220 ) = – (220 – 80) = -140
l) ( – 23 ) + ( – 13 ) = – (23 + 13) = -36
m) ( – 26 ) + ( – 6 ) = – (26 + 6) = -32
n) ( – 75 ) + ( – 50 ) = – (75 + 50) = -125
Đáp án:
`a) 2763 + 152=2915`
`b) ( – 7 ) + ( – 14 )=-21`
`c) ( – 35 ) + ( – 9 )=-44`
`d) ( – 5 ) + ( – 248 )=-253`
`e) ( – 23 ) + 105=105-23=82`
`f) 78 + ( – 123 )=-45`
`g) 23 + ( – 13 )=23-13=10`
`h) ( – 23 ) + 13=-10`
`i) 26 + ( – 6 )=26-6=20`
`j) ( – 75 ) + 50 =-25`
`k) 80 + ( – 220 )=-140`
`l) ( – 23 ) + ( – 13 )=-36`
`m) ( – 26 ) + ( – 6 )=-32`
`n) ( – 75 ) + ( – 50 )=-125`