Bài 2 : Tính nhanh:
a) 3524 – ( 54 – 199) – ( 146 + 399)
b) 1000 – ( 209 + 93) + ( 63 – 91 )
c) – 379 + ( 55 – 101) – ( 25 – 440)
d) – 227 – ( – 156 ) +
Bài 2 : Tính nhanh:
a) 3524 – ( 54 – 199) – ( 146 + 399)
b) 1000 – ( 209 + 93) + ( 63 – 91 )
c) – 379 + ( 55 – 101) – ( 25 – 440)
d) – 227 – ( – 156 ) +
Bài 2
a,3524 – ( 54 – 199) – ( 146 + 399)
=3524+145-545=3124
b,1000 – ( 209 + 93) + ( 63 – 91 )
=1000-302-28=670
c) – 379 + ( 55 – 101) – ( 25 – 440)
=-379-46+415=-10
d) – 227 – ( – 156 )=-71
Bài 2 : Tính nhanh:
a) 3524 – ( 54 – 199) – ( 146 + 399)
= 3524-(-145)-545
= 3124
b) 1000 – ( 209 + 93) + ( 63 – 91 )
= 1000- 302+(-28)
= 670
c) – 379 + ( 55 – 101) – ( 25 – 440)
= -379 + (-46) – (-415)
= -10
d) – 227 – ( – 156 )
= -71
Câu d mk sửa lại bạn viết sai