Question

1 tính

\(\frac{1994.1993-1992.1993}{1992.1993+1994.7+1986}\)

2.tính nhanh

a,\(\frac{399.45+55.399}{1995.1996-1991.1995}\)

b,\(\frac{1995.1993-18}{1993.1994+1975}\)

Answer 1

1)

\(\frac{1994.1993-1992.1993}{1992.1993+1944.7+1986}\)

\(=\frac{\left(1994-1992\right).1993}{2.1985028+2.6804+2.993}\)

\(=\frac{2.1993}{2.\left(1985028+6804+993\right)}\)

\(=\frac{2.1993}{2.1992825}\)

\(=\frac{193}{1992825}\)

2)

a) \(\frac{399.45+55.399}{1995.1996-1991.1995}\)

\(=\frac{399.\left(45+55\right)}{1995.\left(1996-1991\right)}\)

\(=\frac{399.100}{1995.5}\)\(=4\)

Câu b bài 2 mình không biết làm nữa, xin lỗi nhé!