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1/ 35. 18 – 5. 7. 28 = 35.18-35.28 =35.(18-28)=35.(-10)=-350
2/ 45 – 5. (12 + 9) =5.9-5(12+9)=5.(9-12-9)=5.(-12)=-60
3/ 24. (16 – 5) – 16. (24 - 5) =24.16-24.5-16.24+16.5=5.(16-24)=5.(-8)=-40
4/ 29. (19 – 13) – 19. (29 – 13) = 29.19-29.13-19.29+19.13= 13.(19-29)=13.(-10)=-130
5/ 31. (-18) + 31. ( - 81) – 31 =31.(-18-81-1)=31.(-100)=-3100
6/ (-12).47 + (-12). 52 + (-12) = (-12).(47+52+1)=(-12).100=-1200
7/ 13. (23 + 22) – 3. (17 + 28) = 13.45 -3.45=45.(13-3)=45.10=450
8/ -48+48.(-78)+48.(-21) = 48.(-1-78-21)=48.(-100)=-4800
1/ 35. 18 – 5. 7. 28
= 35 . 18 - ( 5 . 7 ) . 28
= 35 . 18 - 35 . 28
= 35 . ( 18 - 28 )
= 35 . ( - 10 )
= - 350
2/ 45 – 5. (12 + 9)
= 45 - 5 . 21
= 45 - 105
= - 60
3/ 24. (16 – 5) – 16. (24 - 5)
= 24 . 11 - 16 . 19
= 264 - 304
= -40
4/ 29. (19 – 13) – 19. (29 – 13)
= 29 . 6 - 19 . 16
= 174 - 304
= - 130
5/ 31. (-18) + 31. ( - 81) – 31
= 31. ( -18 ) + 31 . (-81) + 31 . (-1)
= 31. [-18 + ( -81 ) + ( - 1 ) ]
= 31 . (-100)
= -3100
6/ (-12).47 + (-12). 52 + (-12)
= -12 . (47 + 52 + 1 )
= -12 . 100
= -1200
7/ 13. (23 + 22) – 3. (17 + 28)
= 13 . 45 - 3 . 45
= 45 . (13-3)
= 45 . 10
= 450
8/ -48 + 48. (-78) + 48. (-21)
= 48 . (-1) + 48. (-78) + 48. (-21)
= 48 . [-1 + (-78) + (-21)]
= 48 . (-100)
= -4800
1) \(35.18-5.7.28=35.18-35.28=35\left(18-28\right)=-350\)
2) \(45-5\left(12+9\right)=45-60-45=-60\)
3) \(24\left(16-5\right)-16\left(24-5\right)=24.16-24.5-16.24+16.5=5\left(16-24\right)=5.8=40\)
4) \(29\left(19-13\right)-19\left(29-13\right)=29.19-29.13-19.29+19.13=13\left(19-29\right)=-130\)
5) \(31.\left(-18\right)+31.\left(-81\right)-31=-31.\left(18+81+1\right)=-3100\)
6) \(\left(-12\right).47+\left(-12\right).52+\left(-12\right)=\left(-12\right)\left(47+52+1\right)=-1200\)
7) \(13\left(23+22\right)-3\left(17+28\right)=13.45-3.45=45.\left(13-3\right)=450\)
8) \(-48+48.\left(-78\right)+48.\left(-21\right)=-48\left(1+78+21\right)=-4800\)
35.18-5.7.28
=35.18-35.28
=35.(18-28)
=35.(-10) =-350
Bài 1. tìm x :
a, -16 + 23 + x = -16
23 + x = -16-(-16)
23 + x = 0
x = 0 - 23
Vậy: x = -23
b, 2x - 35 = 15
2x = 15 + 35
2x = 50
x = 50 : 2
Vậy: x = 25
c, 3x + 17 = 12
3x = 12 - 17
3x = -5
Vậy: x = -5/3
d, | x - 1 | = 0
x - 1 = 0
x = 0 + 1
Vậy: x = 1
e, -13 . | x | = -26
-13 . x = -26
x = -26 : ( -13 )
Vậy: x = 2
Mik làm bài 1 còn bài 2 bn tự làm nha
Hok tốt!!!
1) 35.18 - 5.7.28
= 35.18 - 35.28
= 35.(18 - 28)
= 35.(-10)
= -350
2) 45 - 5.(12 + 9)
= 45 - 5.12 - 5.9
= 45 - 60 - 45
= (45 - 45) - 60
= 0 - 60
= -60
3) 24.(16 - 5) - 16.(24 - 5)
= 24.16 - 24.5 - 16.24 + 16.5
= (24.16 - 16.24) - (24.5 + 16.5)
= 0 - (24.5 + 16.5)
= -24.5 + 16.5
= 5.(-24 + 16)
= 5.(-8)
= -40
4) 29.(19 - 13) - 19.(29 - 13)
= 29.19 - 29.13 - 19.29 + 19.13
= (29.19 - 19.29) + (19.13 - 29.13)
= 0 + (19.13 - 29.13)
= 19.13 - 29.13
= 13.(19 - 29)
= 13.(-10)
= -130
5) 31.(-18) + 31.(-81) - 31
= 31.(-18 - 81 - 1)
= 31.(-100)
= -3100
6) (-12).47 + (-12).52 + (-12)
= (-12).(47 + 52 + 1)
= (-12).100
= -1200
7) 13.(23 + 22) - 3.(17 + 28)
= 13.45 - 3.45
= 45.(13 - 3)
= 45.10
= 450
8) -48 + 48.(-78) + 48.(-21)
= 48.(-1) + 48.(-78) + 48.(-21)
= 48.(-1 - 78 - 21)
= 48.(-100)
= -4800
Cố gắng lên nhé em Hoàng Mai Hoa
1)35.18-5.7.28
= 35 . 18 - 35 . 28
= 35 . ( 18 - 28 )
= 35 . ( - 10 )
= - 350