Tính :
a)\(\frac{0,8\times0,44\times1,25\times25}{10\times125\times4\times25\times8}\) b)\(\frac{13,5\times1420+4,5\times580\times3}{3+6+9+.....+24+27}\)
c)\((1,11+0,19-2.6):(2,06+0,54)-(\frac{1}{2}+\frac{1}{3}):2\)
d)\([2\frac{1}{3}+3,5]:[-4\frac{1}{6}+3\times\frac{1}{7}]+7,5\)
e)\(-15,5\times20,8+3,5\times9,2-15,5\times9,2+3.5\times20,8\)
Giúp mk với , thanks nhiều ạ
tính
a)(1,11+0,19-2,6):(2,06+0,54)-(\(\frac{1}{2}+\frac{1}{3}\)):2
b)(\(2\frac{1}{3}+3,5\)):(\(-4\frac{1}{6}+3\frac{1}{7}\))+7,5
Giúp mk vs, nhưng bài này hơi khó đấy, ai đúng mk tích ^_^
Bài 16: Tính nhanh
A =\(\frac{0,8\times0,4\times1,25\times25+0,6524+0,3476}{10\times125\times4\times25\times8}\)
B = \(\frac{18\times123+9\times4567\times2+3\times5310\times6}{1+4+7+10+...+55+58-410}\)
Bài 1:
A=\(\frac{13,5\times1420+4,5\times789\times3}{3+6+9+...+24+27}\)
Bài 2: Chứng minh: A=\(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{2018^2}\)không là số tự nhiên.
Bài 1:
a, T = \(\frac{9^{14}\times25^6\times8^7}{18^{12}\times625^3\times24^3}\)
b, A = \(\frac{5\times4^{15}\times9^9-4\times3^{20}\times8^9}{5\times2^9\times6^{19}-7\times2^{29}\times27^6}\)
\(A=\left(1\frac{1}{6}\times\frac{6}{7}\times6:\frac{3}{5}\right):\left(4\frac{1}{5}\times\frac{10}{11}+5\frac{2}{10}\right)\)
\(B=1\frac{13}{15}\times25\%\times3+\left(\frac{8}{15}-\frac{79}{60}\right):1\frac{23}{4}\)
\(C=\frac{123}{4567}\times\frac{1}{8}+\frac{123}{4567}\times\frac{1}{2}-\frac{123}{4567}\times\frac{13}{8}\)
\(D=\frac{10\frac{1}{3}\times\left(24\frac{1}{2}-15\frac{6}{7}\right)-\frac{12}{11}\times\left(\frac{10}{3}-1,75\right)}{\left(\frac{5}{9}-0,25\right)\times\frac{60}{11}+194\frac{8}{99}}\)
Thực hiện phép tính:
a)\(1\times2\times3\times......\times9-1\times2\times3\times......\times8-1\times2\times3\times.....\times8\times8\)
b)\(B=\frac{\left(3\times4\times2^{16}\right)^2}{11\times2^{13}\times4^{11}-16^9}\)
c)\(C=70\times\left(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\right)\)
d)\(B=\frac{1}{4\times9}+\frac{1}{9\times14}+\frac{1}{14\times19}+...+\frac{1}{64\times69}\)
GIÚP MIK VỚI AI NHANH MIK CHO 3 TICK LUÔN CHO NHA!!!!!!!!!!NHỚ TRÌNH BÀY RÕ RÀNG NHA!!!!!!HELP ME
\(\frac{1}{2\times3}+\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}+\frac{1}{6\times7}+\frac{1}{7\times8}+\frac{1}{8\times9}+\frac{1}{9\times10}\)
Bài 1: Tính bằng cách hợp lí:
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: Tính bằng cách hợp lí( nếu có)
a,\(\left(1,11+0,19-26\right):\left(2,06+0,54\right)-\left(\frac{1}{2}+\frac{1}{3}\right):2\)
b, \(\left(2\frac{1}{3}+3,5\right):\left(-4\frac{1}{6}+3\frac{1}{7}\right)+7,5\)
c, \(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
Bài 3: Tìm x, biết:
a, \(\frac{2}{7}+x=20,75\)
b, \(-4\frac{1}{5}-x=2,25\)
c, \(x:8,5=2,2\)
d, \(\left(\frac{2x}{5}-1\right):\left(-5\right)=\frac{1}{7}\)
\(1\frac{13}{15}\times3\times\left(0,5\right)^2\times3+\left(\frac{8}{15}-1\frac{19}{60}\div1\frac{23}{24}\right)\)
\(\left(-3,2\right)\times\frac{-15}{64}+\left(0,8-2\frac{4}{15}\right)\div1\frac{23}{24}\)
Bài 2 rút gọn\(\frac{2\times\left(-13\right)\times9\times10}{\left(-3\right)\times4\times\left(-5\right)\times26}\)
\(\frac{15\times8+15\times4}{12\times3}\)
