Thực hiện phép tính ( tính hợp lí nếu có thể )
a)\(\frac{1}{5}+\frac{-2}{3}\)
b)\(\frac{15}{12}+\frac{5}{13}-\frac{3}{12}-\frac{18}{13}\)
c) \(\frac{13}{25}+\frac{6}{41}-\frac{38}{25}+\frac{35}{41}-\frac{1}{2}\)
d)\(\frac{5}{6}.18\frac{2}{3}-\frac{5}{6}.6\frac{2}{3}\)
Mấy bạn làm được câu nào thì làm nha! THANKS
\(a.=\frac{3}{15}+\frac{-10}{15}\)
\(=-\frac{7}{15}\)
\(b.=\left(\frac{15}{12}-\frac{3}{12}\right)+\left(\frac{5}{13}-\frac{18}{13}\right)\)
\(=1+\left(-1\right)\)
\(=0\)
\(c.=\left(\frac{13}{25}-\frac{38}{25}\right)+\left(\frac{6}{41}+\frac{35}{41}\right)-\frac{1}{2}\)
\(=-1+1-\frac{1}{2}\)
\(=0-\frac{1}{2}\)
\(=-\frac{1}{2}\)
\(d.=\frac{5}{6}.\left(18\frac{2}{3}-6\frac{2}{3}\right)\)
\(=\frac{5}{6}.12\)
\(=10\)
a)1/5+-2/3
=3/15+-10/15
=-7/15
b)15/12+5/13-3/12-18/13
=(15/12-3/12)+(5/13-18/13)
=1+-1
=0
c)13/25+6/41-38/25+35/41-1/2
=(13/25-38/25)+(6/41+35/41)-1/2
=1+1-1/2
=2-1/2
=2/2-1/2
=1/2
d)5/16x18’2/3-5/6x6’2/3
=5/16x(18’2/3-6’2/3)
=5/16x12
=15/4
Chúc bạn hok tốt😄😄
