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a) 29 - [16 + 3 . (51 - 49)]
= 29 - [ 16 + 3 . 2 ]
= 29 - [ 16 + 6 ]
= 29 - 22
= 7.
b) 47 - [(45 . 16 - 25 . 12) : 14]
= 47 - [ (720 - 300 ) : 14 ]
= 47 - [ 420 : 14 ]
= 47 - 30
= 17.
c) 100 - [60 : (125 : 25 - 3 . 5)]
= 100 - [ 60 : (5 - 3.5) ]
= 100 - [ 60 : ( 5 - 15) ]
= 100 - [60 : (-10) ]
= 100 - (-6)
= 100 + 6
= 106.
d) 2345 - 1000 : [19 - 5(21 - 18)]
= 2345 - 1000 : [ 19 - 5. 3 ]
= 2345 - 1000 : [ 19 - 15 ]
= 2345 - 1000 : 4
= 2345 - 250
= 2095
# HOK TỐT #
a)29-[16 + 3 . (51 - 49)]
=29 - [ 16 + 3 . 2]
=29 - [16 + 6 ]
=29 - 22
=7
b) 47 - [(45 . 16 - 25 . 12) : 14]
= 47 - [( 45 . 16 - 25 .12) : 14]
=47 - [(720 - 300) : 14]
=47 - [420 : 14]
=47 - 30
= 17
c) 100 - [60 : (125 : 25 - 3 . 5)]
= 100 - [ 60 : ( 5 - 15 )]
=100 - [60 : (- 10)]
= 100 - (- 6)
=94
d) 2345 - 1000 : [19 - 5(21 - 18)]
=2345 - 1000 : [ 19 -5 . 3]
=2345 - 1000 : [19 - 15]
= 2345 - 1000 : 4
=2345 - 250
=2095
Bài toán 1: Tính.
a) (-34) + (-91) + (-26) + (-99)
= [(-34) + (-26)] + [(-91) + (-99)]
= -60 + (-190)
= -250
b) 125 + |-25|
= 125 + 25
= 150
c) |-26| + |-34|
= 26 + 34
= 60
d) |-82| + (-120)
= -82 + (-120)
= -202
e) (-275) + |-115|
= -275 + 115
= -160
f) (-34) + |-34|
= (-34) + 34
= 0
a) \(53.\left(-15\right)+\left(-15\right).47=\left(-15\right).\left(53+47\right)=\left(-15\right).100=-1500\)
b) \(\left(-43\right).92-46.27+46.41=\left(-86\right).46-46.27+46.41\)
\(=46\left[\left(-86\right)-27+41\right]=46.\left(-72\right)=-3312\)
c) \(\left(-72\right)\left(15-49\right)+15\left(-56+72\right)=\left(-72\right).15-72.49+15.\left(-56\right)+15.72\)
\(=\left[\left(-72\right).15+15.72\right]-72.49-15.56=0-3528-840=4368\)
d) \(\left(-2^4\right).17.\left(-3\right)^0.\left(-5\right)^6\left(-1^{2n}\right)=16.17.1.12625.\left(-1^{2n}\right)\)
a,\(53.\left(-15\right)+\left(-15\right).47\)
\(=-15.\left(53+47\right)=-15.100=-1500\)
\(b,-43.92-46.27+46.41\)
\(=-43.92-\left[46.\left(27-41\right)\right]=-43.92-\left[46.\left(-14\right)\right]\)
\(=-3956+644=-3312\)
\(c,-72\left(15-49\right)+15\left(-56+72\right)\)
\(=-15.72+49.72+15.\left(-56\right)+15.72\)
\(=72.\left(-15+49+15\right)-15.56=3528-840=2688\)
a) (-325 - 147)-(-625 + 853)-(-96)
= -325 - 147 + 625 - 853 + 96
= -325 + 625 - 147 - 853 + 96
= 300 - 1000 + 96
=-700 + 96
= - 604
a) 53.(-15)+(-15).47
=53.[(-15)+(-15)].47
=53.(-30).47
=-1590.47
=-74730
a) ( -12 ) + ( - 9 ) + 121 + | -20 |
= ( - 21 ) + 121 + 20
= [ ( - 21) + 121 ] + 20
= 100 + 20
= 120
b) 49.125 - 49 .25
= 49 .( 125 -25 )
= 49. 100
= 4900
c) 20 -[ 30 - ( 5- 1)2 ]
= 20 - ( 30 - 42 )
= 20 - ( 30 - 16 )
= 20 - 14
= 6
d) 28 . 76 + 44.28 -28.20
= 28 .( 76 + 44 -20)
= 28 . 100
= 2800
Rin sẽ làm bài 2
a. 4 - 2x = -56
2x = 4 + 56
2x = 60
x = 30
b. -9x + 42 = 66
-9x = 24
x = 24 : -9
x = \(\frac{-24}{9}\)
c. 5 x 1x - 111 = 125
1x - 111 = 25
1x = 136
x = 136
d. (2x +1)2 = 81
(2x +1)2 = 92
=> 2x + 1 = 9
2x = 10
x = 5