a) \(\frac{3}{7}\left(-\frac{5}{2}\right)+\left(-\frac{3}{7}\right)\)
b) \(\frac{2}{3}+\frac{3}{4}\left(-\frac{4}{9}\right)\)
GIÚP EM VỚI Ạ EM CẺM ƠN :))))
Những câu hỏi liên quan
Afrac{1}{2}-frac{3}{4}+frac{5}{6}-frac{7}{12}B3-frac{2}{3}+frac{3}{5}left(-frac{10}{9}-frac{25}{3}right)-frac{5}{6}left(3-frac{3}{4}+frac{2}{3}right)-left(2+frac{4}{3}-frac{3}{2}right)-left(1-frac{7}{3}-frac{9}{2}right)Dleft[-frac{54}{64}-left(frac{1}{9}:frac{8}{27}right):-frac{1}{3}right]:-frac{81}{128}-frac{3}{5}+frac{2}{61}-frac{17}{51}left(frac{3}{2}-frac{5}{11}-frac{3}{13}right)+left(frac{3}{4}+frac{5}{22}+frac{3}{26}right)frac{1}{4}-3cdotleft(frac{1}{12}+frac{3}{8}right)left(-frac{2}{3}+fr...
Đọc tiếp
\(A=\frac{1}{2}-\frac{3}{4}+\frac{5}{6}-\frac{7}{12}\)
\(B=3-\frac{2}{3}+\frac{3}{5}\left(-\frac{10}{9}-\frac{25}{3}\right)-\frac{5}{6}\)
\(\left(3-\frac{3}{4}+\frac{2}{3}\right)-\left(2+\frac{4}{3}-\frac{3}{2}\right)-\left(1-\frac{7}{3}-\frac{9}{2}\right)\)
\(D=\left[-\frac{54}{64}-\left(\frac{1}{9}:\frac{8}{27}\right):-\frac{1}{3}\right]:-\frac{81}{128}\)
\(-\frac{3}{5}+\frac{2}{61}-\frac{17}{51}\)
\(\left(\frac{3}{2}-\frac{5}{11}-\frac{3}{13}\right)+\left(\frac{3}{4}+\frac{5}{22}+\frac{3}{26}\right)\)
\(\frac{1}{4}-3\cdot\left(\frac{1}{12}+\frac{3}{8}\right)\)
\(\left(-\frac{2}{3}+\frac{3}{5}\right):\frac{1}{50}-30\)
\(\left(-\frac{4}{5}+\frac{5}{7}\right):\frac{3}{17}+\left(-\frac{1}{5}+\frac{2}{7}\right):\frac{3}{17}\)
\(\frac{1}{3}-\frac{1}{7}+\frac{8}{9}+\frac{15}{12}-\frac{3}{5}-\frac{2}{3}\)
► Các cậu giúp mình nha. Mình sẽ tick cho ai có đáp án nhanh nhất và đúng nhất nhé. Mình cảm ơn tất cả các cậu trước ạ. Kamsa~
Những câu từ D trở đi là các câu riêng biệt ak bạn
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\(A = {1\over2}-{3\over4}+{5\over6}-{7\over12}={6\over12}-{9\over12}+{10\over12}-{7\over12}\)\(={0\over12}=0\)
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\(B=3-{2\over3}+{3\over5}(-{10\over9}-{25\over3})-{5\over6}\)\(={7\over3}+{3\over5}(-{10\over9}-{75\over9})-{5\over6}\)\(={14\over6}-{5\over6}+{3\over5}({-85\over9})\)\(={3\over2}-{17\over3}={9\over6}-{34\over6}={-25\over6}\)
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a.\(\left(3-\frac{3}{4}+\frac{2}{3}\right)-\left(2+\frac{4}{3}-\frac{3}{2}\right)-\left(1-\frac{7}{3}-\frac{9}{2}\right)\)
b.\(-\frac{1}{3}-\frac{8}{35}+-\frac{2}{9}-\frac{1}{135}+\frac{4}{5}+\frac{4}{-9}+\frac{3}{7}\)
5) Tính
a) \(4.\left(1\frac{1}{4}\right)^2+25.[\left(\frac{3}{4}\right)^2:\left(\frac{5}{4}\right)^3]:\left(\frac{3}{2}\right)^3\)
b) \(3-\left(\frac{-6}{7}\right)^0+\left(\frac{1}{2}\right)^2:2\)
MK CẦN GẤP Ạ , AI NHANH MK TICK NHÉ , CẢM ƠN TRƯỚC
4Aleft(frac{1}{sqrt{25}+frac{1}{5}+1}right):left(frac{1}{25}-frac{1}{sqrt{25}-1}right)..Bfrac{1,5+0,left(3right)-0,1left(6right)}{2,5+1,left(6right)-0,8left(3right)}C1+7+7^2+.........+7^{50}5A-frac{1}{4}+frac{7}{3}+frac{3}{4}+frac{9}{2}-frac{5}{6}Bleft(-0,75-frac{1}{4}right):left(-5right)+frac{1}{15}-left(-frac{1}{5}:left(-3right)right)Cfrac{1}{1cdot2cdot3}+frac{1}{2cdot3cdot4}+.....+frac{1}{2015cdot2016cdot2017}CÁC BN HSG HÃY GIÚP EM 1 TÍ Ạ E KO NHỚ MẤY BÀI NÀY RA SAO Ạ
Đọc tiếp
4
\(A=\left(\frac{1}{\sqrt{25}+\frac{1}{5}+1}\right):\left(\frac{1}{25}-\frac{1}{\sqrt{25}-1}\right)..\)
\(B=\frac{1,5+0,\left(3\right)-0,1\left(6\right)}{2,5+1,\left(6\right)-0,8\left(3\right)}\)
\(C=1+7+7^2+.........+7^{50}\)
5
\(A=-\frac{1}{4}+\frac{7}{3}+\frac{3}{4}+\frac{9}{2}-\frac{5}{6}\)
\(B=\left(-0,75-\frac{1}{4}\right):\left(-5\right)+\frac{1}{15}-\left(-\frac{1}{5}:\left(-3\right)\right)\)
\(C=\frac{1}{1\cdot2\cdot3}+\frac{1}{2\cdot3\cdot4}+.....+\frac{1}{2015\cdot2016\cdot2017}\)
CÁC BN HSG HÃY GIÚP EM 1 TÍ Ạ E KO NHỚ MẤY BÀI NÀY RA SAO Ạ
a,frac{-1}{24}-left[frac{1}{4}-left(frac{1}{2}-frac{7}{8}right)right]
b,left[frac{5}{7}-frac{7}{5}right]-left[frac{1}{2}-left(frac{-2}{7}-frac{1}{10}right)right]
c,left(frac{-1}{2}right)-left(frac{-3}{5}right)+left(frac{-1}{9}right)+frac{1}{71}-left(frac{-2}{7}right)+frac{4}{35}-frac{7}{8}
d,left(3-frac{1}{4}+frac{2}{3}right)-left(5-frac{1}{3}-frac{6}{5}right)-left(6-frac{7}{4}+frac{3}{2}right)
e,left(frac{1}{2}-frac{13}{14}right):frac{5}{7}-left(frac{-2}{21}+frac{1}{7}right):frac{5}{7}
g,f...
Đọc tiếp
a,\(\frac{-1}{24}-\left[\frac{1}{4}-\left(\frac{1}{2}-\frac{7}{8}\right)\right]\)
b,\(\left[\frac{5}{7}-\frac{7}{5}\right]-\left[\frac{1}{2}-\left(\frac{-2}{7}-\frac{1}{10}\right)\right]\)
c,\(\left(\frac{-1}{2}\right)-\left(\frac{-3}{5}\right)+\left(\frac{-1}{9}\right)+\frac{1}{71}-\left(\frac{-2}{7}\right)+\frac{4}{35}-\frac{7}{8}\)
d,\(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5-\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
e,\(\left(\frac{1}{2}-\frac{13}{14}\right):\frac{5}{7}-\left(\frac{-2}{21}+\frac{1}{7}\right):\frac{5}{7}\)
g,\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}:\left(\frac{-1}{7}\right)\)
Tính:Aleft(1-frac{2}{3}+frac{4}{3}right)-left(frac{4}{5}-1right)+left(frac{7}{5}+2right)Bleft(-3+frac{3}{4}-frac{1}{3}right):left(5+frac{2}{5}-frac{2}{3}right)Cleft(frac{3}{5}-frac{4}{15}right).left(frac{2}{7}-frac{3}{14}right)-left(frac{5}{9}-frac{7}{27}right).left(1-frac{3}{5}right)+left(1-frac{11}{12}right).left(1+frac{11}{12}right)Dfrac{left(frac{3}{10}-frac{4}{15}-frac{7}{20}right).frac{-5}{19}}{left(frac{1}{14}+frac{1}{7}-frac{-3}{35}right).frac{4}{3}}
Đọc tiếp
Tính:
A=\(\left(1-\frac{2}{3}+\frac{4}{3}\right)-\left(\frac{4}{5}-1\right)+\left(\frac{7}{5}+2\right)\)
B=\(\left(-3+\frac{3}{4}-\frac{1}{3}\right):\left(5+\frac{2}{5}-\frac{2}{3}\right)\)
C=\(\left(\frac{3}{5}-\frac{4}{15}\right).\left(\frac{2}{7}-\frac{3}{14}\right)-\left(\frac{5}{9}-\frac{7}{27}\right)\)\(.\left(1-\frac{3}{5}\right)+\left(1-\frac{11}{12}\right).\left(1+\frac{11}{12}\right)\)
D=\(\frac{\left(\frac{3}{10}-\frac{4}{15}-\frac{7}{20}\right).\frac{-5}{19}}{\left(\frac{1}{14}+\frac{1}{7}-\frac{-3}{35}\right).\frac{4}{3}}\)
Bài 1: Tính Nhanh
a) 11frac{1}{4}-left(2frac{5}{7}+5frac{1}{4}right)
b) left(8frac{5}{11}+3frac{5}{8}right)-3frac{5}{11}
c) -frac{1}{4}.13frac{9}{11}-0,25.6frac{2}{11}
d)frac{4}{9}:left(frac{-1}{7}right)+6frac{5}{9}:left(frac{-1}{7}right)
Bài 2: Tìm X
a)X:8,25left(-2,2right)
b)-4frac{1}{5}.X2,25
c) left(frac{2X}{5}-1right):left(-5right)frac{1}{7}
Làm chi tiết hộ em được ko ạ : Mai em kiểm tra bài này rùi, mà em ngu lắm á 3
Nhanh hộ em ạ ^^
Đọc tiếp
Bài 1: Tính Nhanh
a) \(11\frac{1}{4}-\left(2\frac{5}{7}+5\frac{1}{4}\right)\)
b) \(\left(8\frac{5}{11}+3\frac{5}{8}\right)-3\frac{5}{11}\)
c) \(-\frac{1}{4}.13\frac{9}{11}-0,25.6\frac{2}{11}\)
d)\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}:\left(\frac{-1}{7}\right)\)
Bài 2: Tìm X
a)\(X:8,25=\left(-2,2\right)\)
b)\(-4\frac{1}{5}.X=2,25\)
c) \(\left(\frac{2X}{5}-1\right):\left(-5\right)=\frac{1}{7}\)
Làm chi tiết hộ em được ko ạ :"< Mai em kiểm tra bài này rùi, mà em ngu lắm á <3
Nhanh hộ em ạ ^^
4
Aleft(frac{1}{sqrt{25}+frac{1}{5}+1}right):left(frac{1}{25}-frac{1}{sqrt{25}-1}right)..
Bfrac{1,5+0,left(3right)-0,1left(6right)}{2,5+1,left(6right)-0,8left(3right)}
C1+7+7^2+.........+7^{50}
5
A-frac{1}{4}+frac{7}{3}+frac{3}{4}+frac{9}{2}-frac{5}{6}
Bleft(-0,75-frac{1}{4}right):left(-5right)+frac{1}{15}-left(-frac{1}{5}:left(-3right)right)
Cfrac{1}{1cdot2cdot3}+frac{1}{2cdot3cdot4}+.....+frac{1}{2015cdot2016cdot2017}
CÁC BN HÃY GIÚP EM 1 TÍ Ạ E KO NHỚ MẤY BÀI NÀY RA SAO Ạ
Đọc tiếp
4
\(A=\left(\frac{1}{\sqrt{25}+\frac{1}{5}+1}\right):\left(\frac{1}{25}-\frac{1}{\sqrt{25}-1}\right)..\)
\(B=\frac{1,5+0,\left(3\right)-0,1\left(6\right)}{2,5+1,\left(6\right)-0,8\left(3\right)}\)
\(C=1+7+7^2+.........+7^{50}\)
5
\(A=-\frac{1}{4}+\frac{7}{3}+\frac{3}{4}+\frac{9}{2}-\frac{5}{6}\)
\(B=\left(-0,75-\frac{1}{4}\right):\left(-5\right)+\frac{1}{15}-\left(-\frac{1}{5}:\left(-3\right)\right)\)
\(C=\frac{1}{1\cdot2\cdot3}+\frac{1}{2\cdot3\cdot4}+.....+\frac{1}{2015\cdot2016\cdot2017}\)
CÁC BN HÃY GIÚP EM 1 TÍ Ạ E KO NHỚ MẤY BÀI NÀY RA SAO Ạ
Em chỉ làm những bài e biết thôi, thông cảm nhs :D
a/ chịu
b/ \(C=1+7+7^2+.........+7^{50}\)
\(\Leftrightarrow7C=7+7^2+...........+7^{50}+7^{51}\)
\(\Leftrightarrow7C-C=\left(7+7^2+.......+7^{51}\right)-\left(1+7+.....+7^{50}\right)\)
\(\Leftrightarrow6C=7^{51}-1\)
\(\Leftrightarrow C=\dfrac{7^{51}-1}{6}\)
c/ \(A=\dfrac{-1}{4}+\dfrac{7}{3}+\dfrac{3}{4}+\dfrac{9}{2}\)
\(=\left(\dfrac{-1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{7}{3}+\dfrac{9}{2}\right)\)
\(=\dfrac{1}{4}+\dfrac{41}{6}\)
\(=\dfrac{85}{12}\)
d/ Thấy phép tính hơi dài
e/ \(C=\dfrac{1}{1.2.3}+\dfrac{1}{2.3.4}+.........+\dfrac{1}{2015.2016.2017}\)
\(\Leftrightarrow2C=\dfrac{2}{1.2.3}+\dfrac{2}{2.3.4}+.........+\dfrac{2}{2015.2016.2017}\)
\(=\dfrac{1}{1.2}-\dfrac{1}{2.3}+\dfrac{1}{2.3}-\dfrac{1}{3.4}+.......+\dfrac{1}{2015.2016}-\dfrac{1}{2016.2017}\)
\(=\dfrac{1}{1.2}-\dfrac{1}{2016.2017}\)
\(=\dfrac{1}{2}-\dfrac{1}{4066272}\)
\(=\dfrac{2033136}{4066272}\)
\(\Leftrightarrow C=\dfrac{2033136}{4066272}:2\)
\(\Leftrightarrow C=?\)
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Tính:
a) \(\left(\frac{-2}{3}+\frac{3}{7}\right):\frac{4}{5}+\left(\frac{-1}{3}+\frac{4}{7}\right):\frac{4}{5}\)
b) \(\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}\right)+\frac{5}{9}:\left(\frac{1}{15}-\frac{2}{3}\right)\)\
GIÚP MÌNH VỚI !
Dùng tích chất kết hợp cho nó lẹ
a/\(\left(\frac{-2}{3}+\frac{3}{7}\right):\frac{4}{5}+\left(\frac{-1}{3}+\frac{4}{7}\right):\frac{4}{5}=\left(\frac{-2}{3}+\frac{3}{7}+\frac{-1}{3}+\frac{4}{7}\right):\frac{4}{5}=\left(-1+1\right):\frac{4}{5}=0\)
b/\(\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}\right)+\frac{5}{9}:\left(\frac{1}{15}-\frac{2}{3}\right)=\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}+\frac{1}{15}-\frac{2}{3}\right)=\frac{5}{9}:\left(\frac{-3}{22}+\frac{-3}{5}\right)=\frac{-5}{3\left(\frac{1}{22}+\frac{1}{5}\right)}=\frac{-550}{81}\)
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Mà hình như câu b mình làm sai
b/\(\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}\right)+\frac{5}{9}:\left(\frac{1}{15}-\frac{2}{3}\right)=\frac{5}{9}:\frac{-3}{22}+\frac{5}{9}:\frac{-3}{5}=\frac{5.22}{9.-3}+\frac{5.5}{9.-3}=\frac{-\left(5.22+5.5\right)}{27}=-5\)
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