45+13=58
(45/13+-32/7)+(18/7+-58/13)
Bài 1:Tính hợp lí:
-5 + (-37 - 45 + 51) - (-37 + 51)
-(15 - 47 + 58) + (15 - 47) +3
(53 - 45 - 49) -( 53 +45 - 49)
13-15+49-13+15-48
Giúp mình vs ạ,mình đang cần gấp!!!
-5 + (-37 - 45 + 51) - (-37 + 51)
= -5 - 37 - 45 + 51 + 37 - 51
= - (5 + 45) - (37 - 37) + (51 - 51)
= - 50 - 0 + 0
= - 50
- (15 - 47 + 58) + (15 - 47 ) + 3
= - 15 + 47 - 58 + 15 - 47 + 3
= (-15 + 15) + (47 - 47) - (58 - 3)
= 0 + 0 - 55
= - 55
(53 - 45 - 49) - (53 + 45 - 49)
= 53 - 45 - 49 - 53 - 45 + 49
= (53 - 53) + (-49 + 49) - (45 + 45)
= 0 + 0 - 90
= - 90
13 - 15 + 49 - 13 + 15 - 48
= (13 - 13) + (-15 + 15) + (49 - 48)
= 0 + 0 + 1
= 1
tính:
a) \(\dfrac{-5}{13}\)+\(\dfrac{8}{13}\) b) \(\dfrac{5}{31}\)+\(\dfrac{-22}{31}\) c) \(\dfrac{-13}{43}\)+\(\dfrac{-40}{43}\)
d) \(\dfrac{-3}{29}\)-\(\dfrac{16}{58}\) e) \(\dfrac{8}{40}\)-\(\dfrac{-36}{45}\) f) \(\dfrac{-8}{18}\)-\(\dfrac{-15}{27}\) g)(-2)+\(\dfrac{-5}{8}\)
ai có thể chỉ giúp tôi được ko vì tôi cần rất gấp
\(a,\dfrac{-5}{13}+\dfrac{8}{13}=\dfrac{3}{13}\\ b,\dfrac{5}{31}+\dfrac{-22}{31}=\dfrac{-17}{31}\\ c,\dfrac{-13}{43}+\dfrac{-40}{43}=\dfrac{-53}{43}\\ d,\dfrac{-3}{29}-\dfrac{16}{58}=\dfrac{-11}{29}\\ e,\dfrac{8}{40}-\dfrac{-36}{45}=1\\ f,\dfrac{-8}{18}-\dfrac{-15}{27}=\dfrac{1}{9}\\ g,\left(-2\right)+\dfrac{-5}{8}=\dfrac{-21}{8}\)
Tính nhanh:
a, [ 168 .168 - 168 .58 ] : 110
b, [456 . 11 +912] . 37 : 13 . 74
c, [ 45 .16 - 17] : [ 28 + 45 . 15]
a ) [ 168 .168 - 168 . 58 ] : 110
= [ 168 . ( 168 - 58 ) ] : 110
= 168 . 110 : 110
= 168 .1
= 168
a. (26-6).(-6)+42.(-7-13)
b. -15.(58-32)-26.(45-69)
c.(-37-17).9+35.(-9-110
d.-25.72+25.21-49.25
a)=20.(-6)+42.(-20)
=-120+(-840)=-960
b)=-15.26-26.(-24)
=-390+624=234
c)=-54.9+35.(-119)
=-486-4165=-4651
d)=25.(-72+21-49)
=25.(-100)=-2500
Thực hiện phép tính:
45-58+(-45)-|-58|-3
45-58+(-45)-|-58|-3
=45-58-45-58-3
=(45-45)-(58+58)-3
=0-116-3
=-119
tk cho mk nha!
bằng
45-58+(-45)-58-3
=[45+(-45)]+[-58+58] -3
=0+0-3
=-3
45 - 58 +(-45)-/-58/ - 3
= 45 - 58 +(-45)- 58 - 3
=[45 + (-45)] + [ - 58 + 58] - 3
= - 3
học tốt
#mọt
[13+(-58)]-[-58-(-13)]-20
sos
[13+(-58)]-[-58-(-13)]-20
= 13 - 58 + 58 - 13 - 20
= (13-13) + (58-58) - 20
= 0+0-20
= -20
Tính bình thường là được nhé. (Đề bài không bảo tính nhanh)
[13 + (-58)] - [-58 - (-13)] - 20
= (-45) - [-58 + 13] - 20
= (-45) - (-45) - 20
= (-45) + 45 - 20
= 0 - 20 = (-20)
a) 92/9 + 13/5 - 56/9
b) 58/7 - (31/9 + 30/7)
c) 2/3 + 1/3 x 9/4 - 13/12
d) 41/8 - 7/4 : 11/5
e) 478/19 : 5/4 - 668/19 : 5/4
f) 32/21 x 49/45 : 16/22 x 15/33
g) 2020x2018+9 / 2019x2020-2011.
Giup minh voi minh dang can gap!!!
58/7 - (31/9 + 30/7)
= 58/7 - 31/9 - 30/7
= (58/7 - 30/7) - 31/9
= 28/7- 31/9
= 4 - 31/9 = 36/9 - 31/9
= 5/9
478/19÷(-5/4)-668/19÷(-5/4)
=(478/19-668/19):(-5/4)
=-10 . (-4/5)
=8
Tim x
a) X x 15 + X x 13 = 560 x 45
( X + X x 2 ) : 34 = 504
360 : X - 126 : X = 6
58 x X - 934 = 6722
14968 - X x 5 = 4968