tính 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50-999-888-777-666-555-444-333-222-111
nhanh nhé
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31
+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+4
7+48+49+50-999-888-777-666-555-444-333-222-111= -3720
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 nhanh
a/[25-(-75)]+32-(32+55)
b/25.17.(-4).125.(-8)
c/(-14).9-13.(-9)
d/37.90-37.(-10)
e/29.(100-47)+85.(47-29)
f/47.(23+50)-23.(47+50)
g/45-5.(17+9)-17.(-15)
h/(-8).(-25)+52.23
tính nhanh
a/[25-(-75)]+32-(32+55)
b/25.17.(-4).125.(-8)
c/(-14).9-13.(-9)
d/37.90-37.(-10)
e/29.(100-47)+85.(47-29)
f/47.(23+50)-23.(47+50)
g/45-5.(17+9)-17.(-15)
h/(-8).(-25)+52.23
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 27 * 28 * 29 * 30 * 31 * 32 * 33 * 34 * 35 * 36 * 37 * 38 * 39 * 40 * 41 * 42 * 43 * 44 * 45 * 46 * 47 * 48 * 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50.
Có ai rảnh đâu mà đi ngồi cộng ngần đấy số ra.
ài 1: Tính giá trị của biểu thức sau:
1)2763 + 152 2)(-7) + (-14)
3)(-35) + (-9) 4)(-5) + (-248)
5)(-23) + 105 6)78 + (-123)
7)23 + (-13) 8)(-23) + 13
9)26 + (-6) 10) (-75) + 50
11)80 + (-220) 12) (-23) + (-13)
13)(-26) + (-6) 14 (-75) + (-50)
15)-18 + (-12) 16)17 + -33
17)(– 20) + -88 18) -3 + 5
19)-37 + 15 20)-37 + (-15)
21)(--32) + 5 22)(--22)+ (-16)
23)(-23) + 13 + ( - 17) + 57 24)14 + 6 + (-9) + (-14)
25) (-123) +-13+ (-7) 26) 0+45+(--455)+-796
câu nầy hơn khó nên mình ko giải đc bạn đợ mình giải đã
1) 2763 + 152 = 2951
2)(-7) + (-14) = -21
3)(-35) + (-9) =-44
4) (-5) + (-248) = -253
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50
NHỚ KẾT BẠN VỚI MÌNH NHA '-'
1 + 2 + 3 +...+ 50
Dãy trên có số số hạng là:
\(\left(50-1\right)+1=50\) (số)
Tổng của chúng là:
\(\frac{\left(50+1\right)\cdot50}{2}=1275\)
Vậy tổng của chúng là 1275
~Học tốt~
