11+16+21+...+211
giúp mik với
Bài1: Tính
a, (-95)+(-105)=
b,38+(-85)=
c,25+(-8)+(-25)+(-2)=
d,18-(-2)=
e, -16-5-(-21)=
f, -11+-(-21)=
g, -13-15+5=
Nếu muốn thì có thể kb với mik !
Quy đồngc mẫu các phân số sau:
a) 11/18 ; -5 /9 ; -4/12
b) -31/48 ; 5/16 ; -11/12
c) -51/21 ; -3/28 ; -45/108
GIÚP MIK VỚI !!!!!!!!!!!!!!!!
Tính tổng
S=52/1×6+52/6×11+52/11×16+52/16×21+52/21×26
Giải giúp mình với
h=11+16+21+26+.....+526
giải hộ em với ạ
Khoảng cách : `5`
Số số hạng là :
\(\dfrac{526-11}{5}+1=104\)
Tổng dãy là :
\(\dfrac{\left(526+11\right)\times104}{2}=27924\)
h=11+16+...+526=\(\dfrac{\left(526-11\right):5+1\cdot\left(11+526\right)}{2}\)=\(\dfrac{104\cdot537}{2}\)=27924.
tính hợp lí
a,-(3\10-6\11)-(21\30-5\11)
b,(13\5+7\16)-(11\16-12\10)
giiups mk với
\(a)-\left(\frac{3}{10}-\frac{6}{11}\right)-\left(\frac{21}{30}-\frac{5}{11}\right)\)
\(=-\frac{3}{10}+\frac{6}{11}-\frac{21}{30}+\frac{5}{11}\)
\(=\left(-\frac{3}{10}-\frac{21}{30}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)\)
\(=-1+1\)
\(=0\)
\(b)\left(\frac{13}{5}+\frac{7}{16}\right)-\left(\frac{11}{16}-\frac{12}{10}\right)\)
\(=\frac{13}{5}+\frac{7}{16}-\frac{11}{16}+\frac{12}{10}\)
\(=\left(\frac{13}{5}+\frac{12}{10}\right)+\left(\frac{7}{16}-\frac{11}{16}\right)\)
\(=\frac{19}{5}+\left(-\frac{1}{4}\right)\)
\(=\frac{71}{20}\)
a) \(-\left(\frac{3}{10}-\frac{6}{11}\right)-\left(\frac{21}{30}-\frac{5}{11}\right)\)
\(=\frac{-3}{10}+\frac{6}{11}-\frac{21}{30}+\frac{5}{11}\)
\(=\left(\frac{-3}{10}-\frac{21}{30}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)\)
\(=\left(\frac{-9}{30}-\frac{21}{30}\right)+1\)
\(=-1+1\)
= 0
b) \(\left(\frac{13}{5}+\frac{7}{16}\right)-\left(\frac{11}{16}-\frac{12}{10}\right)\)
\(=\frac{13}{5}+\frac{7}{16}-\frac{11}{16}+\frac{12}{10}\)
\(=\left(\frac{13}{5}+\frac{12}{10}\right)+\left(\frac{7}{16}-\frac{11}{16}\right)\)
\(=\left(\frac{26}{10}+\frac{12}{10}\right)-4\)
= \(\frac{19}{5}-4\)
= \(\frac{-1}{5}\)
a) \(-\left(\frac{3}{10}-\frac{6}{11}\right)-\left(\frac{21}{30}-\frac{5}{11}\right)\)
\(=\frac{-3}{10}+\frac{6}{11}-\frac{21}{30}+\frac{5}{11}\)
\(=\frac{-3}{10}+\frac{6}{11}-\frac{7}{10}+\frac{5}{11}\)
\(=\left(\frac{-3}{10}-\frac{7}{10}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)\)
\(=-1+1\)
\(=0\)
b) \(\left(\frac{13}{5}+\frac{7}{16}\right)-\left(\frac{11}{16}-\frac{12}{10}\right)\)
\(=\frac{13}{5}+\frac{7}{16}-\frac{11}{16}+\frac{12}{10}\)
\(=\frac{13}{5}+\frac{7}{16}-\frac{11}{16}+\frac{6}{5}\)
\(=\left(\frac{13}{5}+\frac{6}{5}\right)+\left(\frac{7}{16}-\frac{11}{16}\right)\)
\(=\frac{19}{5}+\frac{-1}{4}\)
\(=\frac{76}{20}+\frac{-5}{20}\)
\(=\frac{71}{20}\)
16/11 - 1/3 - 1/15 - 1/21 -.......-1/99
giải giúp mình với
=16/11- (1/3+1/15+...+1/99)
=16/11- (1/1.3+1/3.5+...+1/9.11)
=16/11- 1/2(1/1-1/3+1/3-1/5+...+1/9-1/11)
=16/11 - 1/2(1-1/11)
=16/11 - 1/2. 10/11
=16/11-5/11 = 11/11 =1
5/11*16+5/16*21+5/21*26+...+5/61*66
\(=\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+\frac{1}{21}-\frac{1}{26}+...+\frac{1}{61}-\frac{1}{66}\)
\(=\frac{1}{11}-\frac{1}{66}=\frac{6}{66}-\frac{1}{66}=\frac{5}{66}\)
\(\frac{5}{11.16}+\frac{5}{16.21}+\frac{5}{21.26}+...+\frac{5}{61.66}=5\left(\frac{1}{11.16}+\frac{1}{16.21}+\frac{1}{21.26}+...+\frac{1}{61.66}\right)\)
\(=5\left(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+\frac{1}{21}-\frac{1}{26}+....+\frac{1}{61}-\frac{1}{66}\right)=5\left(\frac{1}{11}-\frac{1}{66}\right)=5.\frac{5}{66}=\frac{25}{66}\)
chứng tỏ B=1/3+1/4+...+1/32>21/11
giúp mik với nha
giải hộ cho mik với
P=2-5/3+7/6-9/10+11/15-13/21+15/28-117/36+19/45-21/55
đúng mik sẽ tick cho
oi dòi ơi bấm máy tính mỏi tay lun:
=-194/99 nhá
Bạn ơi đừng nghiện nữa
:v mik không nghiện :>
7\3 + 1\2 + -16\32
65\91 + -33\55
36\-84 + 109\450
4/20 + 16\42 + 6\10 + -3\5 + 2\21 + -10\21 + 3\10
5\12 + 3\-16 + 3\4
giải hộ mik với nha