a,-3/5+28/5.(43/56+5/24-21/63)
b,17/5.-31/125.1/2.10/17.-1/2^3
c,(11/4.-5/9-4/9.11/4).8/33
A)17/5.-31/125.1/2.10/17.-1/2 mũ 3
B)(11/4.-5/9.4/9.11/4).8/33
C)(135/21 +45/123 - 55/434).(-5/12 + 1/4 + 1/6
D) 132/111. (1 /2 + 1/3 + 7/6)
E)1/5.1/6 + 1/6.1/7 + 1/7.1/8 + 1/8 . 1/9 + 1/9.9/10
F)1/90 + 1/110 + 1/132 +1/156+1/182
Mấy cái dấu / này là dấu phân số nha.Còn dấu chấm là
dấu nhân
B2 tính
a, -3/5+28/5 .(43/56+5/24-21/63)
b, (11/4 . -5/9-4/9 . 11/4).8/33
A)17/5.-31/125.1/2.10/17.-1/2 mũ 3
B)(11/4.-5/9.4/9.11/4).8/33
C)(135/21 +45/123 - 55/434).(-5/12 + 1/4 + 1/6
D) 132/111. (1 /2 + 1/3 + 7/6)
E)1/5.1/6 + 1/6.1/7 + 1/7.1/8 + 1/8 . 1/9 + 1/9.9/10
F)1/90 + 1/110 + 1/132 +1/156+1/182
Mấy cái dấu / này là dấu phân số nha.Còn dấu chấm là
dấu nhân
A)17/5.-31/125.1/2.10/17.-1/2 mũ 3
=(17/5.10/17).(1/2.-1/6).-31/125
=2.(-1/12).(-31/125)
=-1/6.(-31/125)
=31/125
B)(11/4.-5/9.4/9.11/4).8/33
=(11/4.(-5/9.4/9)).8/33
=(11/4.(-1)).8/33
=(-11/4).8/33
=-2/3
C)(135/21 +45/123 - 55/434).(-5/12 + 1/4 + 1/6
=(135/21 +45/123 - 55/434).(5/12+3/12+2/12)
=(135/21 +45/123 - 55/434).0
= 0
D) 132/111. (1 /2 + 1/3 + 7/6)
=12.(3/6+2/6+7/6)
= 12.7/3
= 28
E)1/5.1/6 + 1/6.1/7 + 1/7.1/8 + 1/8 . 1/9 + 1/9.9/10
=1/5.6+1/6.7+1/7.8+1/8.9+(1/9.9/10)
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/10
=1/5-1/10
= 1/10
Mình ko biết làm câu F thông cảm nhé
Sai thì bình luận cho mình biết với nhé
bài 1 : tính
1) \(\left(\frac{9}{10}-\frac{15}{16}\right).\left(\frac{5}{12}+\frac{11}{15}-\frac{7}{20}\right)\) 2) \(\frac{-3}{5}+\frac{28}{5}.\left(\frac{43}{56}+\frac{5}{24}-\frac{21}{63}\right)\)
3) \(\frac{17}{5}.\frac{-31}{125}.\frac{1}{2}.\frac{10}{17}.\frac{-1}{2^3}\) 4) \(\left(\frac{11}{4}.\frac{-5}{9}-\frac{4}{9}.\frac{11}{4}\right).\frac{8}{33}\)
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+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
Dùng tính chất để tính
a) 17/5 . -31/125 . 1/2 . 10/17 . -1/23
b) (11/4 . -5/9 - 4/9 . 11/4) . 8/33
c) (17/28 + 18/29 - 19/30 - 20/31) . (-5/12 + 1/4 + 1/6)
d) -1/4 . 15^2/11 + 68/4 . -1/11
e) -9/25 . 53/3 - (-3/5)^2 .22/3
câu trả lời cho câu hỏi của Huong Le Thị Lan: 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.
=(1+32)+(2+31)+(3+30)+(4+29)+(5+28)+(6+27)+(7+26)+(8+25)+(9+24)+(10+23)+(11+22)+(12+21)+(13+20)+(14+19)+(15+18)+(16+17)
=33+33+33+33+33+33+33+33+33+33+33+33+33+33+33+33. =33.16 (dấu chấm là dấu nhân)=528
wow! mù mắt. Ido tính toán có khác!
C2:(32+1)x32:2=528
bạn tính thử xem đúng đấy.
Câu 1 : (11/4.-5/9-4/9.11/4).8/33
Câu 2 : (17/28+18/29-19/30-20/31).(-5/2+1/4+1/6)
Câu 3 :(1/2+1).(1/3+1).(1/4+1) ... (1/99+1)
Câu 4 : 3/2^2.8/3^2.15/4^2 ... 899/30^2
Câu 11:
(\(\dfrac{11}{4}\). \(\dfrac{-5}{9}\) - \(\dfrac{4}{9}\).\(\dfrac{11}{4}\)).\(\dfrac{8}{33}\)
= \(\dfrac{11}{4}\).(\(\dfrac{-5}{9}\) - \(\dfrac{4}{9}\)). \(\dfrac{8}{33}\)
= \(\dfrac{11}{4}\).(-1).\(\dfrac{8}{33}\)
= - \(\dfrac{2}{3}\)
Câu 2: (\(\dfrac{17}{28}\) + \(\dfrac{18}{29}\) - \(\dfrac{19}{30}\) - \(\dfrac{20}{31}\)).(-\(\dfrac{5}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{6}\))
= (\(\dfrac{17}{28}\) + \(\dfrac{18}{29}\) - \(\dfrac{19}{30}\) - \(\dfrac{20}{31}\)).(-\(\dfrac{5}{2}\) + \(\dfrac{5}{12}\))
= (\(\dfrac{17}{28}\) + \(\dfrac{18}{29}\) - \(\dfrac{19}{30}\) - \(\dfrac{20}{31}\)). 0
= 0