Bài 4. Bỏ dấu ngoặc rồi tính:
a) 4567 + (1234 – 4567) – 4 b) (144 – 97) – 144
c) 2021 – (53 + 2021) – (-53) d) 111 + (-111 + 27)
e) (27 + 514) – ( – 486 – 73) f) (36 + 79) + (145 – 79 – 36)
g) 10 – [12 – (- 9 – 1)] h) (38 – 29 + 43) – (43 + 38)
a) 4567 + (1234 – 4567) – 4 b) (144 – 97) – 144
= 4567 + 1234 – 4567 – 4 = 144 – 97 – 144
= (4567 – 4567) + (1234 – 4) = (144 – 144) – 97
= 0 + 1230 = 0 – 97
= 1230 = -97
c) 2021 – (53 + 2021) – (-53) d) 111 + (-111 + 27)
= 2021 – 53 + 2021 – (-53) = 111 + (-111)+27
= (2021 – 2021) – [53 + (-53)] = [111 + (-111)] + 27
= 0 – 0 = 0 + 27
= 0 = 27
e) (27 + 514) – ( -486 – 73) f) (36 + 79) + (145 – 79 – 36)
= 27 + 514 – (-486) – 73 = 145 + (36 – 36) + (79 – 79)
= 27 + 514 + 486 – 73 = 145 + 0 + 0
=( 514 + 486 ) – (27 + 73) = 145
= 1000 – 100
= 900
g) 10 – [12 – (-9 -1)] h) (38 – 29 + 43) – (43 + 38)
= 10 – 12 – (-9) – 1 = 38 – 29 + 43 – 43 + 38
=-12 =-29
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a) 4567 + (1234 – 4567) – 4
= 4567 + 1234 – 4567 – 4
= 1230
b)(144 – 97) – 144
=144 – 97 -144
= -97 c) 2021 – ( 53 +2021 ) – (-53)
=2021 – 53 – 2021 + 53
=0
d) 111 + ( -111 +27)
=111 – 111 + 27
= 27
e) ( 27 +514) – ( – 486 -73 )
= 27 + 514 + 486 + 73
= 27 + 73 + 514 + 486
= 100 + 1000
= 1100
f) ( 36 + 79 ) + ( 145 – 79 – 36 )
= 36 + 79 + 145 – 79 – 36
= 145
g) 10 – [12-(-9-1)]
= 10 – ( 12 + 9 + 1 )
= 10 – 22
= – 12
h) (38 – 29 +43) – (43 +38)
= 38 – 29 + 43 – 43 – 38
= -29