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Tính hợp lý :
45-45.(-12+3)
=45-45.(-9)
=45-(405)
=kết quả
31.(-18)+31.(-81)-31
=31.(-18)+31.(-81)-31.1
=31.[-18+(-81)+(-1)]
=31.(-100)
Kquả
24.(16-5)-16.(24-5)
=24.16-24.5-16.24-16.5
=(26.16-16.24)-24.5-16.5
=0-(24-16)5
=0-8.5
0-40
(-12).47+(-12).52+(-12).1
=-12.[47+52+1]
=-12.100
=-1200
1: =20*(-4)+24(-30)
=-80-720=-800
2: =-13*57+13*32+57*13-57*45
=13*32-57*45=-2149
3: =-12*8*125
=-12*1000=-12000
4: =(-134)(1-51+48)
=(-134)*(-2)=268
5: =(-24)(45-5)=40*(-24)=-960
45-58+(-45)+(+58)-3=45-58-45+58-3=(45-45)+(58-58)-3=-3
(-57)-(-12)+3-(-57)=-57+12+3+57=(-57+57)+12+3=15
-(-24)-(-30)+(-24)-30+8=24+30-24-30+8=(24-24)+(30-30)+8=8
-(-12)+(+19)-(+12)+8-19=12+19-12+8-19=(12-12)+(19-19)+8=8
47-(-53)+(-47)-(+53)=47+53-47-53=(47-47)+(53-53)=0
-(+28)+32-(-28)+(-34)=-28+32+28-34=(-28+28)-(34-32)=-2
15-(+72)+(-15)+(+72)=15-72-15+72=(15-15)+(72-72)=0
20-(+46)+(-25)-(-46)=20-46-25+46=(20-25)+(46-46)=-5
28-(-32)+(-28)-32+5=28+32-28-32+5=(28-28)+(32-32)+5=5
-75+(-49)+(+75)+49-12=-75-49+75+49-12=(-75+75)+(49-49)-12=-12
\(...=45-58-45+58-3=-3\)
\(...=-57+12+3+57=15\)
\(...=24+30-24-30+8=8\)
\(...=12+19-12+8-19=8\)
\(...=47+53-47-53=0\)
\(...=-28+32+28-34=-2\)
\(...=15-72-15+72=0\)
\(...=20-46-25+46=-5\)
\(=...28+32-28-32+5=5\)
\(...=-75-49+75+49-12=-12\)
a) \(70-\left(x-3\right)=45\)
\(x-3=70-45\)
\(x-3=25\)
\(x=25+3\)
\(x=28\)
b) \(12+\left(5+x\right)=20\)
\(5+x=20-12\)
\(5+x=8\)
\(x=8-5\)
\(x=3\)
c) \(130-\left(100+x\right)=25\)
\(100+x=130-25\)
\(100+x=105\)
\(x=105-100\)
\(x=5\)
d) \(175+\left(30-x\right)=200\)
\(30-x=200-175\)
\(30-x=25\)
\(x=30-25\)
\(x=5\)
e) \(\left(x+12\right)+22=92\)
\(x+12=92-22\)
\(x+12=70\)
\(x=70-12\)
\(x=58\)
f) \(95-\left(x+2\right)=45\)
\(x+2=95-45\)
\(x+2=50\)
\(x=50-2\)
\(x=48\)
a)
70 - (x - 3) = 45
x - 3 = 70 - 45 = 25
x = 25 + 3 = 28
Vậy x = 28
b)
12 + (5 + x) = 20
5 + x = 20 - 12 = 8
x = 8 - 5 = 3
Vậy x = 3
c)
130 - (100 + x) = 25
100 + x = 130 - 25 = 115
x = 115 - 100 = 15
Vậy x = 15
d)
175 + (30 - x) = 200
30 - x = 200 - 175 = 25
x = 30 - 25 = 5
Vậy x = 5
e)
(x + 12) + 22 = 92
x + 12 = 92 - 22 = 70
x = 70 - 12 = 58
Vậy x = 58
f)
95 - (x + 2) = 45
x + 2 = 95 - 45 = 50
x = 50 - 2 = 48
Vậy x = 48
a) \(\dfrac{38}{45}=\dfrac{152}{180}\); \(\dfrac{7}{12}=\dfrac{105}{180}\); \(\dfrac{17}{20}=\dfrac{153}{180}\); \(\dfrac{13}{18}=\dfrac{130}{180}\)
Sắp xếp theo thứ tự tăng dần : \(\dfrac{7}{12}-\dfrac{13}{18}-\dfrac{38}{45}-\dfrac{17}{20}\)
b) \(-\dfrac{7}{12}=-\dfrac{35}{60};-\dfrac{5}{12}=-\dfrac{25}{60};-\dfrac{3}{5}=-\dfrac{36}{60}\)
Sắp xếp theo thứ tự tăng dần : \(-\dfrac{3}{5};-\dfrac{7}{12};-\dfrac{5}{12}\)
a: \(\dfrac{7}{12}< \dfrac{13}{18}< \dfrac{38}{45}< \dfrac{17}{20}\)
b: \(-\dfrac{3}{5}< -\dfrac{7}{12}< -\dfrac{5}{12}\)
a, 45 - 45 . ( -12 + 3 )
= 45 - 45 . (-9)
= 45 -(- 405)
=450
b, 31 . ( -18 ) + 31 . ( - 81 ) - 31
= 31. [ -18 + (-81 ) - 1 ]
= 31. (-100)
= -3100
Giúp mình với:(
123+45
=1728+45
=1773