Bỏ ngoặc rồi tính:
c, 126 - (126 - 33)=
d, (-53 - 23) - (567 - 53) =
e, 145 - (23 - 45) - (-23 - 10) =
Bài 2. Tính hợp lý:
d) (-15) - 23+ (-85) -77;
e) (123 - 37) - 123; f) (-224) - (34 - 224);
g) 126 - (126- 33) h) (-53 - 23) - (567 - 53).
Em zai tui
d) ( - 15 ) - 23 + ( - 85 ) - 77
= ( - 15 - 85 ) - ( 23 + 77 )
= - 100 - 100
= - 200
e) ( 123 - 37 ) - 123
= ( 123 - 123 ) - 37
= 0 - 37
= - 37
f) ( - 224 ) - ( 34 - 224 )
= ( - 224 + 224 ) - 34
= 0 - 34
= - 34
g) 126 - ( 126 - 33 )
= ( 126 - 126 ) - 33
= 0 - 33
= - 33
h) ( - 53 - 23 ) - ( 567 - 53 )
= ( - 53 + 53 ) + ( - 23 - 567 )
= 0 - 590
= - 590
d) ( - 15 ) - 23 + ( - 85 ) - 77
= ( - 15 - 85 ) - ( 23 + 77 )
= - 100 - 100
= - 200
e) ( 123 - 37 ) - 123
= ( 123 - 123 ) - 37
= 0 - 37
= - 37
f) ( - 224 ) - ( 34 - 224 )
= ( - 224 + 224 ) - 34
= 0 - 34
= - 34
g) 126 - ( 126 - 33 )
= ( 126 - 126 ) - 33
= 0 - 33
= - 33
h) ( - 53 - 23 ) - ( 567 - 53 )
= ( - 53 + 53 ) + ( - 23 - 567 )
= 0 - 590
= - 590
Tính:
a) (123 - 37) - 123; b) (-224) - (34 - 224);
c) 126 - (126- 33) d) (-53 - 23) - (567 - 53)
a) (123 - 37) -123 -123 - 37 -123 = (123 -123) - 37 = -37.
b) (-224) - (34 - 224) = -224 - 34 + 224 - (-224 + 224) - 34 = -34.
c) 126 - (126 - 33) = 126 -126 + 33 = 33.
d) (-53 - 23) - (567 - 53) - -53 - 23 - 567 + 53 = -590
a) (123 - 37) -123 -123 - 37 -123 = (123 -123) - 37 = -37.
b) (-224) - (34 - 224) = -224 - 34 + 224 - (-224 + 224) - 34 = -34.
c) 126 - (126 - 33) = 126 -126 + 33 = 33.
d) (-53 - 23) - (567 - 53) - -53 - 23 - 567 + 53 = -590
Bài 2. Tính hợp lý:
d) (-15) - 23+ (-85) -77;
e) (123 - 37) - 123; f) (-224) - (34 - 224);
g) 126 - (126- 33) h) (-53 - 23) - (567 - 53).
d) ( - 15 ) - 23 + ( - 85 ) - 77
= ( - 15 - 85 ) - ( 23 + 77 )
= - 100 - 100
= - 200
e) ( 123 - 37 ) - 123
= ( 123 - 123 ) - 37
= 0 - 37
= - 37
f) ( - 224 ) - ( 34 - 224 )
= ( - 224 + 224 ) - 34
= 0 - 34
= - 34
g) 126 - ( 126 - 33 )
= ( 126 - 126 ) - 33
= 0 - 33
= - 33
h) ( - 53 - 23 ) - ( 567 - 53 )
= ( - 53 + 53 ) + ( - 23 - 567 )
= 0 - 590
= - 590
tui chỉ viết bài làm thôiii
d
-15+(-85)-23-77=100-100=0
e
123-37-123=123-123-37=-37
g
126-126+33=33
f
-224-34+224=-224+224-34=-34
h
-53-23-567+53=-53+53-23-567=-23-567=-590
d) (-15) - 23 + (-85) - 77
= [-15 + (-85)] - (23 + 77)
= -100 - 100
=- 200
e) (123 - 37) - 123
= 123 - 123 - 37
= - 37
f) (-224) - (34 - 224)
= (-224 + 224) - 34
= -34
g) 126 - (126 - 33)
= 126 - 126 + 33
= 33
h) (-53 - 23) - (567 - 53)
= -53 - 23 - 567 + 53
= (-53 + 53) - (23 + 567)
= -600
@Nghệ Mạt
#cua
Câu 1: Tính
a, ( -14 ) + 5 + 17 + 14
b, 40 + 13 + ( -25 ) + ( -13 )
c, ( -5 ) + ( -146 ) + ( -15 ) + 14
d, ( -2 ) + ( -5 ) + 20 + ( -13 )
Câu 2: Tính
a, ( 123 - 37 ) - 123
b, ( -224 ) - ( 34 - 224 )
c, 126 - ( 126 - 33 )
d, ( -53 23 ) - ( 567 - 53 )
Câu 1:
a:=17+5=22
b: =40-25=15
d) - ( 12 + 21 - 23) - ( 23 - 21 +10 )
e) ( 57 -752 ) - ( 605 - 53 )
g) ( 55 + 45 + 15) - (15 - 55 +45)
Bỏ ngoặc r tính
d ] [ 12 + 21 - 23 ] - [ 23 - 21 + 10 ]
= 10 - 22
= - 12
e [ 57 - 752 ] - [ 605 - 53 ]
= -695 - 552
= -1247
Tính nhanh :
a) ( -53 -23 ) - ( 567 - 53 )
b) - 126 . 39 + 126 . ( - 15 ) + 252 . ( - 23 )
-(12+21-23)-(23-21+10) bỏ dấu ngoặc rồi tính
(57-725)-(605-53) (nhu tren)
(55+45+45)- (15-55+45) (như trên)
a) -(12+21-23)-(23-21+10)
=-12-21+23-23+21-12=-12-12=-24
b)(57-725)-(605-53)
=57-725-605+53=-1220
c)(55+45+45)-(15-55+45)
=55+45+45-15+55-45=110+45-15=140
-(12+21-23)-(23-21+10)
=-12-21+23-23+21-10
=(21-21)+(23-23)-(12+10)
=0+0-22=-22
(57-725)-(605-53)
=57-725-605+53
=(57+53)-(725+605)
=110-1330
=-1220
(55+45+45)- (15-55+45)
=55+45+45-15+55-45
=(45+55)+(55-15)+(45-45)
=100+40+0=140
-(12+21-23) - (23-21+10) = -12 - 21 + 23 - 23 + 21 - 10 = (-12-10) + (21-21) + (23-23) = -22 + 0 + 0 = -22
(57 - 725) - (605 - 53) = 57 - 725 - 605 + 53 = (57 + 53) - (725 + 605) = 110 - 1330 = 1220
(55 + 45 + 45) - (15 - 55 + 45) = 55 + 45 + 45 - 15 + 55 - 45 = (55 + 55) + (45 - 45) + (45 - 15)
= 110 + 0 + 30 = 140
Bài 2:Bỏ dấu ngoặc rồi tính:
1) (12+21)-(23-21+10)
2) (57-725)-(605-53)
3) (55+45+15)-(15-55+45)
Bỏ dấu ngoặc rồi tính
a (15+37)+(52-37-17)
b (38-42+14)-(25-27-15)
c -(21-32)-(-12+32)
d -(12+21-23)-23-21+10)
e (57-725)-(605-53)
f (55+45=15)-(15-55+45)
a/ =15+37+52-37-17
=(15+52)-17+(37-37)
=67-17+0
=50
b/=38-42+14-25+27+15
=-4+14+27-25+15
=10+27-40
=37-40
=-3
c/=-21+32+12-32
=-21+12+32-32
=11+0
=11
d/=-12-21+23-23+21-10
=-33+0+11
=-22
e/=57-725-605+53
=-668-605+53
=-1273+53
=-1220
f/=55+45+15-15+55-45
=55+55+45-45+15-15
=110+0+0
=110