Tinh gia tri bieu thuc
1+3+5+7+.....+35+37+39
Tinh gia tri bieu thuc sau:a.(2/3)^3^0-(5/3-3/4)^2. b.(53/4-59/27-65/6).230.1/25+187/4):(10/7+10/3):(37/7-100/7)
tinh gia tri bieu thuc
198,06-5,9x6;3/5:5/7+3/8
198,06-5,9x6
= 198,06 - 35,4
= 162,66
3/5 : 5/7 + 3/8
=21/25 +3/8
= 243/200
= 1,215
\(198,06-5,9\times6:\dfrac{3}{5}:\dfrac{5}{7}+\dfrac{3}{8}\)
\(=198,06-35,4:0,6:\dfrac{5}{7}+\dfrac{3}{8}\)
\(=198,06-59:\dfrac{5}{7}+\dfrac{3}{8}=198,06-82,6+0,375\)
\(=115,46+0,375=115,835\)
#YVA6
tinh gia tri cua bieu thuc
1995-321*3-6020:35
1995-321*3-6020:35
=1995-963-172
=1032-712
=320
1995-321x3-6020:35=1995-963-172=1032-172=320
1995 - 321 x 3 - 6020 : 35
=1995 - 963 - 172
=1032 - 172
=320
bai 1: Tinh gia tri cua bieu thuc:
a) 12 : { 390 : [ 500 - ( 125 + 35 . 7 ) ] }
b) 12000 - ( 1500 . 2 + 1800 . 3 + 12 . 2 : 3 )
a) 12 : { 390 : [ 500 - ( 125 + 35. 7 ) ] }
= 12 : { 390 : [ 500 - ( 125 + 245 ) ] }
= 12 : { 390 : [ 500 - 370 ] }
= 12 : { 390 : 130 }
= 12 : 3
= 4
b) 12000 - ( 1500 .2 + 1800 .3 + 12 . 2 : 3 )
= 12000 - ( 3000 + 5400 + 8 )
= 12000 - 8408
= 3592
a) 12 : { 390 : [ 500 - ( 125 + 35 . 7 ) ] }
= 12 : {390 : [500 - (125 + 245)]}
= 12 : [390 : (500 - 370)]
= 12 : (390 : 130)
= 12 : 3 = 4.
b/ 12000 - ( 1500 . 2 + 1800 . 3 + 12 . 2 : 3 )
= 12000 - (3000 + 5400 + 24 : 3)
= 12000 - (8400 + 24 : 3)
= 12000 - (8400 + 8)
= 12000 - 8408
= 3592.
Tinh gia tri cua bieu thuc: 7/11:3/5 + 4/11 x 5/6
\(\frac{7}{11}:\frac{3}{5}+\frac{4}{11}x\frac{5}{6}\)
=\(\frac{7}{11}x\frac{5}{3}+\frac{20}{66}\)
=\(\frac{35}{33}+\frac{10}{33}\)
=\(\frac{45}{33}\)
=\(\frac{15}{11}\)
= 7/11 x 5/3 + 4/11 x 5/6
= 35/33 + 10/33
=15/11
CHÚC BẠN HỌC TỐT
cho bieu thuc:
A=(6-2/3+1/2)-(5+5/3-3/2)-(3-7/3+5/2)
hay tinh gia tri cua A theo hai cach
cach 1:truoc het tinh gia tri tung bieu thuc trong ngoac
cach 2:bo dau ngoac roi nhom cac so hang thich hop
C1: \(A=\left(\frac{36}{6}-\frac{4}{6}+\frac{3}{6}\right)-\left(\frac{150}{30}+\frac{50}{30}-\frac{45}{30}\right)-\left(\frac{18}{6}-\frac{14}{6}+\frac{15}{6}\right)\)
\(=\frac{35}{6}-\frac{155}{30}-\frac{19}{6}=\frac{35}{6}-\frac{31}{6}-\frac{19}{6}=-\frac{15}{6}=-2\frac{1}{2}\)
C2: \(6-\frac{2}{3}+\frac{1}{2}-5-\frac{5}{3}+\frac{3}{2}-3+\frac{7}{3}-\frac{5}{2}\)
\(=\left(6-5-3\right)-\left(\frac{2}{3}+\frac{5}{3}-\frac{7}{3}\right)+\left(\frac{1}{2}+\frac{3}{2}-\frac{5}{2}\right)\)
\(=-2-0-\frac{1}{2}=-2\frac{1}{2}\)
Tinh gia tri bieu thuc [m + n ]:p neu m=5,n=19 va p=3 .Vay gia tri bieu thuc la:
Tinh gia tri bieu thuc: C = 1 - 3 + 5 - 7 + ........................+ 2013 - 2015 + 2017
Kết quả k tính đc vì dãy số k có quy luật
So cac so hang tru 2017:(2015-1)/2+1=1008 so=504 cap (1-3)=504 cap -2
-2*504+2017=-1008+2017=1009
minh nha
Tinh gia tri bieu thuc
A = 1 + (-3) +5 + (-7)+............+ 97 + (-99) + 101
A = 1 + (-3) +5 + (-7)+............+ 97 + (-99) + 101
A = ( -2 ) + ( - 2 ) +..........+ ( -2 ) + 101 ( có 25 số -2 )
A = -2 . 25 + 101
A = - 50 + 101
A = 51
A = 1 + (-3 ) + 5 + (-7 ) + ......+ 97 + (-99) + 101
Dãy trên có :
101 - 1 : 2 + 1 = 51
Ta ghép mỗi bộ 2 số vậy có 25 bộ.
A = [ 1 + (-3 ) ] + [ 5 + (-7 ) ] + .....+ [ 97 + ( -99) ] +101
A = - 2 + (-2 ) + ...... + -2 + 101
Dãy trên có 25 số -2
A = -2 × 25 + 101
A = - 50 + 101
A = 51