tinh gia tri bieu thuc : 2004-5+5+5+...+5(co 101 so 5) lop 3
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
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 cua bieu thuc :
a] (18 1/2 + 5 3/8 - 7 5/24) : 16 2/3
b] 2005 x 2007 -1 / 2004 + 2005 x 2006
a) chắc bạn cũng biết
b) \(\frac{2005.2007-1}{2004+2005.2006}=\frac{2005.\left(2006+1\right)-1}{2004+2005.2006}=\frac{2005.2006+2005.1-1}{2004+2005.2006}=\frac{2005.2006+2004}{2004+2005.2006}=1\)
dung nam chu so 5 ,dau cac phep tinh va dau ngoac (neu can ),hay viet mot bieu thuc co gia tri bang 6
-0,6 x X - 7/3 = 5,4
2,8 : (1/5 - 3 x X) = 1 2/5
lop 6a co 3 loai hs gioi kha va trung binh. trong do 2/3 so hs gioi la 8 em. so hs gioi bang 80% so hs kha. so hs trung binh bang 7/9 tong so hs kha va hs gioi tim so hs cua lop
tinh gia tri cua bieu thuc sau: a= 7/4 x (3333/1212 + 3333/2020 + 3333/3030 + 3333/4242)
Tự làm đi bạn, đừng hỏi nhũng câu dễ như Thế này
tim so nguyen a de bieu thuc sau co gia tri la so nguyen : M=(2a+8):5+(-a-7):5
tinh gia tri bieu thuc:
1+[-3]+5+[-7]+...+97+[-99]+101
[GIAI CHI TIET HO MINH NHA DANG CAN GAP MINH CAM ON NHIEU ]
(1+[-3])+(5+[-7])+...+(97+[-99])+101
= (-2) +(-2)+..+(-2)+101
=(-2).25+101
=-50+101
=51
tick đấy
Tinh gia tri bieu thuc A = 5/1.2 + 5/2.3 +...+ 5/99.100
A = 5/1.2 + 5/2.3 +...+ 5/99.100
2A = 10/1.2 + 10/2.3 +...+ 10/99.100
2 A = 5/1-5/2+5/2-5/3+5/3-5/4+...+5/99-5/100
2A=5/1-5/100
2A=9/2 => A=9/2:2=9/4
cho 1 đ-ú-n-g nha bạn!!
99/20 đảm bảo
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