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
TL:
a) 29 - [16 + 3 . (51 - 49)]
= 29 - ( 16+3 . 2)
= 20 - ( 16+6)
= 20 - 22
= (-2)
b) 47 - [(45 . 16 - 25 . 12) : 14]
= 47- ( 420:14)
= 47- 30
= 17
c) 100 - [60 : (125 : 25 - 3 . 5)]
= 100 - ( 60: (-10)
= 100 - (-6)
= 106
d) 2345 - 1000 : [19 - 5(21 - 18)]
= 2345 - 1000 : 4
= 2345-250
= 2095
Học tốt
Làm lại câu c:c) 100 - [60 : (125 : 25 - 3 . 5)]
= 100 - [60 : (125 : 25 - 3 .5)]
= 100 -[ 60 : (5 - 15)
= 100 - [ 60 : (-10)]
= 100 - (-6)
= 100 + 6
=106
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
\(a,29-\left[16+3.\left(51-49\right)\right]\)
\(=29-\left[16+3.2\right]\)
\(=29-\left(16+6\right)\)
\(=29-22=7\)
\(b,47-\left[\left(45.16-25.12\right):14\right]\)
\(=47-\left[420:14\right]\)
\(=47-30=17\)
\(c,100-\left[60:\left(125:25-3.5\right)\right]\)
\(=100-\left[60:\left(5-15\right)\right]\)
\(=100-\left[60:\left(-10\right)\right]\)
\(=100-\left(-6\right)=100+6=106\)
\(d,2345-1000:\left[19-5\left(21-18\right)\right]\)
\(=2345-1000:\left[19-5.3\right]\)
\(=2345-1000:\left(19-15\right)\)
\(=2345-1000:4\)
\(=2345-250=2095\)
