Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a,= 21x 22x 68/11x 17x 63=21x 11x 2x 17x 4/11x 17x 21x 3=8/3
b,= 5x 7x 26/14x13x25= 5x 7x 13x 2/7x 2x 13x 5x 5
tinh bang cach thuan tien nhat : 2.017 * 35.6 + 63.4 * 2.017 + 2.017
giup mik nha mik sap thi cuoi nam hoc roi
\(2,9\times5+2,9:0,25+5,8-29\times0,1\)
\(=2,9\times5+2,9\times4-2,9+5,8\)
\(=2,9\times\left(5+4+1\right)+5,8\)
\(=2,9\times10+5,8\)
\(=29+5,8\)
\(=34,8\)
40,16 x 2,5 : 5
= 40,16 x 0,5
= 20,08
khi nhân một số với 0,5 ta chỉ việc chi số đó cho 2
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=\frac{15}{15}+\frac{13}{13}\)
\(=1+1\)
\(=2\)
Chúc bạn học tốt nha !!!
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{17}{15}:\left(\frac{9}{5}+\frac{8}{5}\right)\)
\(=\frac{17}{15}:3\)
\(=\frac{17}{45}\)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{5}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=3\)
\(\frac{5}{9}:\frac{4}{7}+\frac{13}{9}\cdot\frac{7}{4}\)
\(=\frac{5}{9}\cdot\frac{7}{4}+\frac{13}{9}\cdot\frac{7}{4}\)
\(=\left(\frac{5}{9}+\frac{13}{9}\right)\cdot\frac{7}{4}\)
\(=2\cdot\frac{7}{4}\)
\(=\frac{14}{4}\)
=\(\frac{5}{9}\)*\(\frac{7}{4}\)+\(\frac{13}{9}\)*\(\frac{7}{4}\)
=\(\frac{7}{4}\)*(\(\frac{5}{9}+\frac{13}{9}\))
=\(\frac{7}{4}\)*2
=\(\frac{7}{2}\)
dinh hoang vu
\(\frac{1212}{1515}=\frac{1212\div101}{1515\div101}\)
\(=\frac{12}{15}=\frac{4}{5}\)
a) 21/17 x 22/17 x 68/63
= 21 x 11 x 2 x 17 x 4 / 11 x 17 x 21 x 3
= 8/3
b) 5/14 x 7/13 x 26/25
= 5 x 7 x 13 x 2 / 7 x 2 x 13 x 5 x 5
= 1/5