173-(36-173)+[(125-27)-17-(-36+50)
-173-(36+173)+(175-27)-175-(-36+50)
-173-(36+173)+(172-27)-(-36+50)=-173-36-173+36-50
=(-173-173)+(36-36)-50
=-346+0-50
=-346-50=-396
Tính bằng cách hợp lý
a, 5 - ( 1997 - 2005 ) +1997
b, 4567 +(1234 -4567 ) - 4
c, 173 - ( 36 + 173 ) + [( 175 - 27) -175 - (-36 +50 )]
d, 3 x ( 25 : 5 -14 : 2 ) -5 x ( 6 : 2 )
dễ mà : a, 5 - ( 1997 - 2005 ) +1997
= ( 2005 + 5 ) - ( 1997 - 1997 )
= 2010 - 0
= 2010
a, 5 - (1997 -2005 ) + 1997
= 5 - 1997 + 2005 +1997
= (5 + 2005 ) - ( 1997 - 1997)
= 2010 - 0
= 2010
b, 4567 + (1234 - 4567 )-4
= 4567 + 1234 - 4567 -4
= (4567 - 4567 ) + (1234 - 4)
= 0 + 1230
= 1230
c, 173 - ( 36 + 173 ) + [(175 - 27 ) - 175 - ( -36 + 50 )]
= 173 - 36 - 173 + 175 - 27 - 175 - 36 - 50
= ( 173 - 173 ) + (175 - 175 ) - ( 36 + 36 ) - (27 + 50)
= 72 - 77
= -5
d, 3 . (25 : 5 - 14 : 2 ) - 5 . ( 6 : 2)
= 3 (-2) - 5 .3
= 3 ( -2 - 5 )
= 3 . (-7 )
= - 21
a) 5-(1997-2005)+1997
= 5-(-1997)+2005+1997
= (5+2005)+(-1997+1997)
= 2010+0
= 0
b) 4567+(1234-4567)-4
làm tương tự câu a
Câu 4 : Bỏ ngoăc rồi tính
a) 173 - ( 36 + 27 ) + [ ( 175 - 173 ) - ( - 36 + 175 ) - 50 ]
b) - 428 - ( 176 - 2750 ) - [ 2750 - ( 176 + 482 ) ] - 147
c) [ ( 321 - 797 ) - ( - 371 + 1900 ) ] - 321 - [ 371 + ( - 797 ) ]
d) [ - ( 4625 + 1907 ) + ( - 164 + 4625 ) ] - [ ( 1243 - 1907 ) - 164 ]
GIÚP MINH NHA => MÌNH K
Tính hợp lí:
1) 173-(36+173)+[(175-27)-175-(-36+50)]
2) -[-171+(171+23)]-[172-(38+172)]-49
3) 2750-(2085+2750)-[-438-(29-438)]
4/ -482-(176-48)-[2750-(176+2750)]
5/ -382-[1925+(-382)]-[(3210-697)+(-3210+597)]
Giúp mik vs mik đag cần gấp cho ngày mai
1/173-36-173+175-27-175+36-50=(173-173)+(36-36)+(175-175)-(27+50)=-77
2/-(-171+171+23)-(172-38-172)-49=-23-(-38)-49=-23+38-49=15-49=-34
4/-482-176+48-(2750-176-2750)=-482-176+48+176=-482+48=-434
5/đề sai bạn ơi
g) (-457) + (-123) + 23 +237
h) 1 - 3 + 5 - 7 + ... + 41 - 43 + 45 - 47
i) 173 + (-46) + (-54) + (+27)+ (-19)
k) (-52) + 13 + 49 + (-15) + (-36) + 82
l) 3 + (-5) + 7 + (-9) + 11 + (-13) + 15 + (-17)
m) 1 + (-2) + 3 + (-4) + ... + 2001 + (-2002) + 2003
n) (-51) + (-53) + (-55) + ... + (-97) + (-99)
o) (-62) + (+1523) + (-38) + (-2523)+ (-92)
g: \(=-457+237+23-123=-220-100=-320\)
h: \(=\left(1-3\right)+\left(5-7\right)+...+\left(41-43\right)+\left(45-47\right)\)
\(=\left(-2\right)+\left(-2\right)+...+\left(-2\right)+\left(-2\right)\)
\(=-2\cdot12=-24\)
i: \(=173+27-46-54-19=200-100-19=100-19=81\)
k: \(=-52+82+49-15+13-36\)
\(=30+34-23\)
=30+11
=41
l: \(=\left(3-5\right)+\left(7-9\right)+\left(11-13\right)+\left(15-17\right)\)
\(=\left(-2\right)+\left(-2\right)+\left(-2\right)+\left(-2\right)\)
=-8
m: \(=\left(1-2\right)+\left(3-4\right)+...+\left(2001-2002\right)+2003\)
\(=2003-1-1-...-1\)
\(=2003-1001=1002\)
n:Số số hạng là:
\(\left[\left(-51\right)-\left(-99\right)\right]:1+1=49\left(số\right)\)
Tổng là \(\left(-51-99\right)\cdot\dfrac{49}{2}=-3675\)
o: \(=-62-38+1523-2523-92\)
\(=-100+1000-92=900-92=808\)
Tính nhanh
a) \(5-\left(1997-2005\right)+1997\)
b) \(1579-\left(53+1579\right)-\left(-53\right)\)
c) \(-48-\left(357-48\right)+300\)
d) \(173-\left(36+173\right)+[\left(175-27\right)-175-(-36+50)]\)
e) \(-[-171+\left(171+23\right)]-[172-\left(38+172\right)]-49\)
Giúp mik vs ạ
Bài 1: Chứng minh đẳng thức sau
a,- (a+b+c)-(b+c+1)=(b-a+c)+(1-a+c)
b,(a+b)+(b-c)-(a-c-1)=1-20.
Bài 2:Tính nhanh
a, -(81-32 - 47 ) + 81 - (32+2 )
b, 173-( 36+173) + [ ( 175 - 27 ) -175- (-36 +50)]
c, 79.89-11.(-79)
d, 24.(-15) + (-15).75-15
e, 128.(278-302) +278.(302 - 128 )
f, 34.(-15)-15.62 + (-81).115+177.115
Tính bằng cách thuận tiện nhất 125+173+175+27 125 x 75 + 125 x 25 =???? Giúp em mik đi
\(125+173+175+27=\left(125+175\right)+\left(173+27\right)=300+200=500\)
\(125\times75+125\times25=125\times\left(75+25\right)=125\times100=12500\)
125 + 173 + 175 + 27 = ( 125 + 175 ) + ( 173 + 27 ) = 300 + 200 = 500
125 × 75 + 125 × 25 = 125 × ( 75 + 25 ) = 125 × 100 = 12500
Tính nhanh
a) \(5-\left(1997-2005\right)+1997\)
b) \(1579-\left(53+1579\right)-\left(-53\right)\)
c) \(-48-\left(357-48\right)+300\)
d) \(173-\left(36+173\right)+\left[\left(175-27\right)-175-\left(-36+50\right)\right]\)
e) \(-\left[-171+\left(171+23\right)\right]-\left[172-\left(38+172\right)\right]-49\)
Làm ơn giúp mik vs ạ mik đag cần gấp!
\(5-\left(1997-2005\right)+1997\)
\(=5-1997+2005+1997\)
\(=2010\)
\(1579-\left(53+1579\right)-\left(-53\right)\)
\(=1579-53-1579+53\)
\(=0\)
\(-48-\left(357-48\right)+300\)
\(=\)\(-48-357+48+300\)
\(=-57\)
\(173-\left(36+173\right)+\left(175-27\right)-175-\left(-36+50\right)\)
\(=173-36-173+175-27-175+36-50\)
\(=-27-50\)
\(=-77\)
\(\)
\(-\left[-171+171+23\right]-\left[172-\left(38+172\right)\right]-49\)
\(=171-171-23-172+38+172-49\)
\(=-23+38-49=-34\)