bai 1, tinh tong
a, -31+(-95)+131+(-5)
bai 2, tinh
a, 555+(-100)+(-80)+/-333/
b, /-347/+(-40)+3150+(-307)
c, /-129/-119+/2-31/
Tính:
D=|-347|+(-40)+3150+(-307)
R =|-129|-119+|2-31|
Q= 100+98+96+...+4+2-97-95-...-3-1
D=|-347|+(-40)+3150+(-307)
=347-40+3150-307=3150
R =|-129|-119+|2-31|
=129-119+31-2=39
R =|-129|-119+|2-31|
\(=129-119+29\) \(=10+29\)\(=39\)Q= 100+98+96+...+4+2-97-95-...-3-1
Tính :
A= [(- 8 ) + ( - 7 ) ] + ( -10) ;
B = - ( - 299 ) + ( - 219 ) + ( -401 ) + 12
C = 555 + ( - 100) + ( -80) + \(\left|-333\right|\)
D = \(\left|-347\right|\) + ( - 40 ) + 3150 + ( - 307)
E= 98 . 42 – {50 . [(18 – 23) : 2 + 32 ]}
F = - 80 - [ - 130 – ( 12 – 4 )2] + 20080
G = 1000 + ( - 670 ) + 297 + ( - 330 )
H = 1024 : 24 + 140 : ( 38 + 25) – 723 : 721
I = \(\left|-129\right|\)-119+\(\left|2-31\right|\)
K = 219 +573 + 381 – 173
L = 36 . 33 – 105 . 11 + 22 . 15
N = 160 – ( 2 3 .52 – 6 . 25 )
O = (44 . 52 . 60 ) : ( 11 . 13 .15 )
P = (217 +154) . ( 3 19 – 217 ) . ( 24 - 42)
Q = 100 + 98 + 96 + ….. + 4 +2 – 97 – 95 - …… - 3 – 1
Giải:
\(A=\left[\left(-8\right)+\left(-7\right)\right]+\left(-10\right)=\left(-15\right)+\left(-10\right)=\left(-25\right)\)
\(B=-\left(-299\right)+\left(-219\right)+\left(-401\right)+12=299-219-401+12=-309\)
\(C=555+\left(-100\right)+\left(-80\right)+\left|-333\right|=555-100-80+333=708\)
\(D=\left|-347\right|+\left(-40\right)+3150+\left(-307\right)=347-40+3150-307=2456\)
\(E=98.42-\left\{50.\left[\left(18-2^3\right):2+3^2\right]\right\}\)
\(E=4116-\left\{50.\left[\left(18-8\right):2+9\right]\right\}\)
\(E=4116-\left\{50.\left[10:2+9\right]\right\}\)
\(E=4116-\left\{50.\left[5+9\right]\right\}\)
\(E=4116-\left\{50.14\right\}\)
\(E=4116-700\)
\(E=3416\)
\(F=-80-\left[-130-\left(12-4^2\right)\right]+2008^0\)
\(F=-80-\left[-130-\left(12-16\right)\right]+1\)
\(F=-80-\left[-130-\left(-4\right)\right]+1\)
\(F=-80-\left(-126\right)+1\)
\(F=47\)
\(G=1000+\left(-670\right)+297+\left(-330\right)=1000-670+297-330=297\)
\(H=1024:2^4+140:\left(38+2^5\right)-7^{23}:7^{21}\)
\(H=2^{10}:2^4+140:\left(38+32\right)-7^2\)
\(H=2^6+140:70-49\)
\(H=64+2-49\)
\(H=17\)
\(I=\left|-129\right|-119+\left|2-31\right|=129-119+\left|-29\right|=10+29=39\)
\(K=219+573+381-173\)
\(K=\left(219+381\right)+\left(573-173\right)\)
\(K=600+400\)
\(K=1000\)
\(L=36.33-105.11+22.15\)
\(L=36.33-35.3.11+11.2.3.5\)
\(L=36.33-35.33+33.10\)
\(L=33.\left(36-35+10\right)\)
\(L=33.11\)
\(L=363\)
\(N=160-\left(2^3.5^2-6.25\right)\)
\(N=160-\left[25.\left(8-6\right)\right]\)
\(N=160-\left[25.2\right]\)
\(N=160-50\)
\(N=110\)
\(O=\left(44.52.60\right):\left(11.13.15\right)=137280:2145=64\)
\(P=\left(2^{17}+15^4\right).\left(3^9-2^{17}\right).\left(2^4-4^2\right)=\left(2^{17}+15^4\right).\left(3^9-2^{17}\right).0=0\)
\(Q=100+98+96+...+4+2-97-95-...-3-1\)
\(Q=100+\left(98-97\right)+\left(96-95\right)+...+\left(4-3\right)+\left(2-1\right)\)
\(Q=100+1+1+...+1+1\)
Vì có 98:2=49 số 1
\(\Rightarrow Q=100+49\)
\(Q=149\)
tính :
a) 555 +(-100) + (-80) + |-333|
b) |-347| + (-40) + 3150 +(-307)
c) 1024 : 24 + 140 :( 38 +25 ) - 723 : 721
d) ( 217 + 154 ) . ( 319 - 217 ) . ( 24 - 42 )
a.
\(555+\left(-100\right)+\left(-80\right)+\left|-333\right|=555-100-80+333=708\)
b.
\(\left|-347\right|+\left(-40\right)+3150+\left(-307\right)=347-40+3150-307=3150\)
c.
\(1024\div2^4+140\div\left(38+2^5\right)-7^{23}\div7^{21}=2^{10}\div2^4+140\div\left(38+32\right)-7^2=2^6+140\div70-49=64+2-49=17\)
d.
\(\left(2^{17}+15^4\right)\times\left(3^{19}-2^{17}\right)\times\left(2^4-4^2\right)=\left(2^{17}+15^4\right)\times\left(3^{19}-2^{17}\right)\times\left(16-16\right)=\left(2^{17}+15^4\right)\times\left(3^{19}-2^{17}\right)\times0=0\)
sao mk ko thấy đáp số vậy bn , an làm chi tiết đ/s cho mk vs
Tinh:
C = 555 + ( -100 ) + ( - 80 ) + | - 333 |
D = 98 . 42 - { 50 . [( 18 - 23 ) : 2 + 32 ]}
E = | - 129 | - 199 + | 2 - 31 |
F = ( - 37 - 17 ) . ( - 9 ) + 35 . ( - 9 - 11 )
G= ( - 25 ) . ( 75 - 45 ) - 75 . ( 45 - 25 )
M = - 12 . ( 3 - 14 ) + 2 . ( 45 - 54 )
C = 555 - 100 - 80 + 333 = 708
D = 98 . 42 - { 50 . (5 + 9)} = 4116 - 700 = 3416
E = 129 - 199 + 29 = - 41
F = (- 54).(-9) + 35.(-20) = 486 - 700 = - 214
G = - 25 . 30 - 75 . 20 = - 750 - 1500 = - 2250
M = - 12 . (-11) + 2 . (-9) = 132 - 18 = 114
C=42
D=48,28
E= 41
mình tính từng đó thôi lớp 5 mà
Bài 2. Tính hợp lý các giá trị biểu thức sau:
27.99+99.35:31:2 76.34-19.64:38.9 555+-100+-80+-333 1000--137-263+-572+-291 -600+253+-40+3150+-307 145+-217--318+-783-245+318 125-170+120+-125+-864-36 1-2+3-4+5-6+…+997-998+999-1000Tính tổng;
a/ (-125)+100+80+125+20
b/27+55+(-17)+(-55)
c/(-92)+(-251)+(-8)+251
d/(-31)+(-95)+131+(-5)
Tính tổng :
a,(-125)+100+80+125+20
b,27+55+(-17)+(-55)
c,(-92)+(-251)+(-8)+251
d,(-31)+(-95)+131+(-5)
a, 120
b,10
c,-100
d,0
a) (-125) + 100 + 80 + 125 + 20
= [(-125) + 125] + (80 + 20) + 100
= 0 + 100 + 100
= 200
b) 27 + 55 + (-17) + (-55)
= [27 + (-17)] + [55 + (-55)]
= (27 - 17) + 0
= 10
c) (-92) + (-251) + (-8) + 251
= [(-251) + 251] + [(-92) + (-8)]
= 0 - 100
= -100
d) (-31) + (-95) + 131 + (-5)
= [(-31) + 131) + [(-95) + (-5)]
= 100 + (-100)
= 0
Hok tốt
a) -125 + 100 + 80 + 125 + 20
= ( -125 + 125 ) + ( 80 + 20 ) + 100
= 0 + 100 + 100
= 200
b) 27 + 55 + (-17) + (-55)
= [ 27 + (-17) ] + [ 55 +(-55) ]
= 10 + 0
= 10
c) -92 + (-251) + (-8) + 251
= [ -92 + (-8) ] + ( -251 + 251 )
= -100 + 0
= -100
d) -31 + (-95) + 131 + (-5)
= ( -31 + 131 ) + [ -95 + (-5) ]
= 100 + (-100) = 0
347+(-40)+3150+(-307
\(347+\left(-40\right)+3150+\left(-307\right)\)
\(=\left(347-40-3-7\right)+3150\)
\(=0+3150\)
\(=3150\)
\(347+\left(-40\right)+3150+\left(-307\right)\)
\(=\left(347-307\right)+\left(-40+3150\right)\)
\(=40+3110\)
\(=3150\)
có thể viết rõ hơn ko mình ko hiểu