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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) \(-48+48.\left(-78\right)+48.\left(-21\right)=-48\left(1+78+21\right)=-4800\)
1/ \(45.18-5.9.28\\ =45.18-45.28\\ =45.\left(18-28\right)\\ =45.\left(-10\right)=-450\)
2/\(54-6.\left(12+9\right)\\ =6.\left(9-12-9\right)\\ =6.\left(-12\right)\\ =-72\)
3/ \(23.\left(16-5\right)-16.\left(23-5\right)\\ =23.16-23.5-16.23+16.5\\ =5.\left(-23+16\right)\\ =5.\left(-7\right)=-35\)
4, \(29.\left(2019-13\right)-2019.\left(29-13\right)\\ =29.2019-29.13-29.2019+13.2019\\ =13.\left(-29+2019\right)\\ =13.1990=25870\)
5/\(31.\left(-18\right)+31.\left(-80\right)-31.2\\ =31.\left[\left(-18\right)+\left(-80\right)-2\right]\\ =31.\left(-100\right)\\ =-3100\)
6/ \(\left(-12\right).48+\left(-12\right).51+\left(-12\right)\\ =\left(-12\right).\left(48+51+1\right)\\ =\left(-12\right).100\\ =-1200\)
1/ 45. 18 – 5. 9. 28
= 45 . 18 – 45 . 28
= 45 . (18 - 28)
= 45 . (-10)
= -450
2/ 54 – 6. (12 + 9)
= 54 – (6 . 12 + 6 . 9)
= 54 – 6 . 12 - 6 . 9
= 54 - 6 . 9 – 6 . 12
= 54 - 54 - 72
= 0 - 72
= -72
3/ 23. (16 – 5) – 16. (23 - 5)
= (23 . 16 – 23 . 5) – (16 . 23 - 16 . 5)
= 23 . 16 – 23 . 5 – 16 . 23 + 16 . 5
= (23 . 16 – 16 . 23) + (-23 . 5 + 16 . 5)
= (23 . 16 – 16 . 23) + 5 . (-23 + 16)
= 0 + 5 . (-7)
= 5 . (-7)
= -35
4/ 29. (2019 – 13) – 2019. (29 – 13)
= (29. 2019 – 29 . 13) – (2019. 29 – 2019 . 13)
= 29. 2019 – 29 . 13 – 2019. 29 + 2019 . 13
= (29 . 2019 - 2019 . 29) + (2019 . 13 - 29 . 13)
= (29 . 2019 - 2019 . 29) + 13 . (2019 - 29)
= 0 + 13 . 1990
= 0 + 25870
= 25870
5/ 31. (-18) + 31. ( - 80) – 31.2
= 31 . [(-18) + (-80) - 2]
= 31 . (-100)
= -3100
6/ (-12) . 48 + (-12) . 51 + (-12)
= (-12) . 48 + (-12) . 51 + (-12) . 1
= (-12) . (48 + 51 + 1)
= (-12) . 100
= -1200
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
1) = 35 . 18 - 35 . 18 = 0
2) = 45 - 5 . 12 + 5 . 9 = 45 - 60 + 45 = 30
3) = 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= (24 . 16 - 16 . 24) - 5 (24 - 16)
= 0 - 5 . 8 = 0 - 40 = -40
4) = 29 . 19 - 29 . 13 - 19 . 29 - 19 . 13
= (29 . 19 - 29 . 19) - 13 (29 - 19)
= 0 - 13 . 10 = 0 - 130 = -130
5) = 31 . (-18) + 31 . (-81) - 31 . 1
= 31 [(-18) + (-81) - 1]
= 31 . (-100) = -3100
6) = (-12) . 47 + (-12) . 52 + (-12). 1
= (-12) . (47 + 52 + 1)
= (-12) . 100 = -1200
7) = 13 . 45 - 3 . 45
= 45 (13 - 3)
= 45 . 10 = 450
8) = (-48) + 48 . (-78) + 48 . (-21)
= (-48) . 1 + 48 . (-78) + 48 . (-21)
= 48 . (-1) + 48 . (-78) + 48 . (-21)
= 48 . [(-1) + (-78) + (-21)]
= 48 . (-100) = -4800
1) 35x18-5x7x18
= 35x18-35x18
= 35x(18-18)
= 35x0=0
3) 24.(16-5)-16.(24-5)
= 24.16-24.5-16.24-16.5
=[24.16-16.24]-[24.5-16.5]
= [ 24. (16-16)]- [(24-16).5]
= [24.0]-[8.5]
= 0-40=-40
4) 29.(19-13)-19.(29-13)
=29.19-29.13-19.29-19.13
=[ 29.19-19.29]-[ 29.13-19.13]
= [ 29.(19-19)]-[(29-19).13]
=[29.0]-[10.13]
= 0-130= -130
5) 31.(-18)+31.(-81)-31
= 31.(-18)+31.(-81)-31.1
= 31.[(-18)+(-81)-1]
=31.(-100)
= -3100
6);7);8 tương tự 4);5);6)
35.18-5.7.28
=35.18-35.28
=35.(18-28)
=35.(-10) =-350
1/ 45. 18 - 5. 9. 28
= 45. 18 - (5. 9) . 28
= 45.18 - 45 .28
= 45. ( 18 - 28)
= 45. ( -10)
= -450
2/ 54 - 6. (12 + 9)
= 54 - 6. 9 + 6. 12
= 54 - 54 + 6. 12
= 0 + 6. 12
= 72