b) 50 – [(20 – 23) : 2 + 34]
50 -[( 20 - 23) :2 + 34]
50 - [ ( 20 - 23 ) : 2 + 34]
= 50 - [ ( 20 - 8 ) : 2 + 34 ]
= 50 - [ 12 : 2 + 34 ]
= 50 - [ 6 + 34 ]
= 50 - 40
=10.
\(50-\left[\left(20-2^3\right):2+34\right]\)
\(=50-\left[\left(20-8\right):2+34\right]\)
\(=50-\left[12:2+34\right]\)
\(=50-\left[6+34\right]=50-40=10\)
Bài 5: Thực hiện phép tính:
a) 47 – [(45.24 – 52.12):14] | a) 3.52 + 15.22 – 26:2 |
b) 50 – [(20 – 23) : 2 + 34] | b) (- 25) . (- 4 ) + (- 70) . 3 |
c) 102 – [60 : (56 : 54 – 3.5)] | c) 62 : (- 9) - 50.2 – 33.(- 3) |
d) 50 – [(50 – 23.5):2 + 3] | d) 32.(- 50) - 23.10 – 81: (- 3) |
e) 10 – [(82 – 48).5 + (23.10 + 8)] : 28 | e) 513 : 510 – 25.22 |
f) 8697 – [37 : 35 + 2(13 – 3)] | f) 20 : 22 + 59 : 58 |
g) 2011 + 5[300 – (17 – 7)2] | g) 100 : 52 + 7.32 |
h) 695 – [200 + (11 – 1)2] | h) 84 : 4 + 39 : 37 + 50 |
i) 129 – 5[29 – (6 – 1)2] | i) 29 – [16 + 3.(51 – 49)] |
j) 2010 – 2000 : [486 – 2(72 – 6)] | j) 53.2 – 100 : 4 + 23.5 |
f: =20:4+5
=5+5
=10
e: =125-100=25
.Thực hiện phép tính
a) 47 – [(45.24 – 5 2 .12):14]
b) 50 – [(20 – 2 3 ) : 2 + 34]
c) 102 – [60 : (56 : 54 – 3.5)]
d) 50 – [(50 – 2 3 .5):2 + 3]
e) 10 – [(82 – 48).5 + (23 .10 + 8)] : 28
f) 8697 – [37 : 35 + 2(13 – 3)]
g) 2011 + 5[300 – (17 – 7)2 ]
h) 695 – [200 + (11 – 1)2 ]
k) 2345 – 1000 : [19 – 2(21 – 18)2 ]
l) 128 – [68 + 8(37 – 35)2 ] : 4
m) 568 – {5[143 – (4 – 1)2 ] + 10} : 10
n) 107 – {38 + [7.32 – 24 : 6+(9 – 7)3 ]}:15
o) 307 – [(180 – 160) : 22 + 9] : 2
p) 205 – [1200 – (42 – 2.3)3 ] : 40
q) 177 :[2.(42 – 9) + 32 (15 – 10)]
r) [(25 – 2 2 .3) + (32 .4 + 16)]: 5
i) 129 – 5[29 – (6 – 1)2 ]
j) 2010 – 2000 : [486 – 2(72 – 6)]
s) 125(28 + 72) – 25(32 .4 + 64)
t) 500 – {5[409 – (23 .3 – 21)2 ] + 103 } : 15
Sao bạn bỏ một khoảng trống giữa các số 5 2 với 2 3v?
50 - [( 50 - 23 .5): 2 + 34]
50 - [ ( 50 - 23 . 5 ) : 2 + 34 ]
= 50 - [ ( 50 - 40 ) : 2 + 34 ]
= 50 - [ 10 : 2 + 34 ]
= 50 - [ 5 + 34 ]
= 50 - 39
= 11.
50-\([\left(50-2^3\cdot5\right):2+34]\)=50-\([\)5+34\(]\)=50-39=11.
50 - [ ( 50 - 23 . 5 ) : 2 + 34 ]
= 50 - [(2 . 5 . 5 - 2 . 4 . 5) : 2 + 34]
= 50 - [(5 . 5 - 4 . 5 ) + 34]
= 50 - (5 + 34)
= 11
a, 50 - [ ( 20 - 2^3 ) : 2 + 34 ] b, 50 - [ ( 50 - 2^3 . 5 ) : 2 +3 ] LÀM ƠN GIÚP MÌNH
a. - (- 94) + (67 - x) : 2 = (- 34 - 14)
b. 73 - (- 20 + 37) = x - (57 - 39)
c. - (- 34 - 23) = x + 37
\(a,-\left(-94\right)+\left(67-x\right):2=\left(-34-14\right)\)
\(94+67-x:2=-48\)
\(161-x:2=-48\)
\(x:2=209\)
\(x=\frac{209}{2}\)
câu c thật ra là : - (- 34 - 23) = - x + 37
a. - (- 94) + (67 - x) : 2 = (- 34 - 14)
<=>94+(67-x):2=-48
<=>67-x:2=142
<=>x:2=-75
<=>x=-150
Vậy x=-150
b. 73 - (- 20 + 37) = x - (57 - 39)
<=>73+20-137=x-18
<=>x-18=-44
<=>x=-26
Vậy x=-26
c. - (- 34 - 23) = x + 37
34+23=x+37
<=>57=x+37
<=>x=20
Vậy x=20
a) 47 – [(45.24 – 52.12):14] b) 50 – [(20 – 23) : 2 + 34] c) 102 – [60 : (56 : 54 – 3.5)] d) 50 – [(50 – 23.5):2 + 3] e) 10 – [(82 – 48).5 + (23.10 + 8)] : 28 f) 8697 – [37 : 35 + 2(13 – 3)] g) 2011 + 5[300 – (17 – 7)2] h) 695 – [200 + (11 – 1)2] i) 129 – 5[29 – (6 – 1)2] tính nhanh
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Thực hiện phép tính:
a) 5 . (-8) . 2 . (-3) d) (-15) + 14 + (-85)
b) 3 . (-5)2 + 2 . (-5) - 20 e) 34 . ( 15 - 10 ) - 15 . ( 34 - 10 )
c) 15 + 23 + (-25) + (-23) g) 60 - (-33) + (-50) + (-33)
a) 5 . (-8) . 2 . (-3)
= (5 . 2) . [(-8).(-3)]
= 10 . 24
= 240
b) 3 . (-5)2 + 2 . (-5) - 20
= 3 . 25 + [(-10) - 20]
= 75 + (-30)
= 45
c) 15 + 23 + (-25) + (-23)
= [15 + (-25)] + [23 + (-23)]
= -10
a) 5 . (-8) . 2 . (-3)
=-40.2.(-3)
=-80.(-3)
=240
d) (-15) + 14 + (-85)
=-1+(-85)
=-86
b) 3 . (-5)2 + 2 . (-5) - 20
=3.25+2.(-5)-20
=75-10-20
=65-20
=45
e) 34 . ( 15 - 10 ) - 15 . ( 34 - 10 )
=34.5-15.24
=170-360
=-190
c) 15 + 23 + (-25) + (-23)
=38+(-25)+(-23)
=13+(-23)
=-10
g) 60 - (-33) + (-50) + (-33)
= 93 - 50 - 33
= 43 - 33
= 10
a) = 5. 8 . 2 . 3=240
b) = 3 . 5 . 5 - 2 . 5 - 4 . 5 = 5. ( 15-2-4)= 5 .9=45
c) = 15 + 23 - 25 - 23 = (15-25) + (23-23) = -10+0=-10
d) = [ (-15) + ( -85) ] + 14
= -100 + 14 = -86
e) =34.15-34.10 - 15.34 + 15.10= (34.15-15.34) + 15.10 - 34.10= 0 + 150-340=-190
g) = 60 + 33 - 50 - 33 = (60 - 50) + ( 33 - 33) = 10
50-[(20-2^3):2+34]=