65x42-130x21+1986

=65x2x21-65x2x21+1986(tách)

=0+1986

=1986

\(=\dfrac{1994.1993-1992.1993}{1992.1993+1994.7+1986}=\dfrac{1993.\left(1994-1992\right)}{1992.1993+1992.7+2.7+1986}\)

\(=\dfrac{2.1993}{1992.\left(1993+7\right)+14+1986}=\dfrac{2.1993}{1992.2000+2000}=\dfrac{2.1993}{\left(1992+1\right).2000}\)

\(=\dfrac{2.1993}{1993.2000}=\dfrac{2}{2000}=\dfrac{1}{1000}\)

nguyễn trung hiếu bấm máy chứ gì 

Câu hỏi của kudo - Toán lớp 6 - Học toán với OnlineMath

Em tham khảo bài làm tại link này nhé!

\(\frac{x-1986-1987}{1985}+\frac{x-1985-1987}{1986}+\frac{x-1985-1986}{1987}=3\)

=> \(\left(\frac{x-1986-1987}{1985}-1\right)+\left(\frac{x-1985-1987}{1986}-1\right)+\left(\frac{x-1985-1986}{1987}-1\right)=3-3\)

=> \(\frac{x-1985-1986-1987}{1985}+\frac{x-1985-1986-1987}{1986}+\frac{x-1985-1986-1987}{1987}=0\)

=> \(\left(x-1985-1986-1987\right).\left(\frac{1}{1985}+\frac{1}{1986}+\frac{1}{1987}\right)=0\)

=> \(\left(x-5958\right).\left(\frac{1}{1985}+\frac{1}{1986}+\frac{1}{1987}\right)=0\)

Mà \(\frac{1}{1985}+\frac{1}{1986}+\frac{1}{1987}\ne0\)

=> x - 5958 = 0

=> x = 5958

=2005/16 nha bn

\(A=\frac{1984.1985+\left(1985+1\right).20+1965}{1985\left(2000-1984\right)}=\frac{1984.1985+1985.20+1985}{1985.16}=\frac{1985.\left(1984+20+1\right)}{1985.16}=\frac{2005}{16}\)