Question

Tính nhanh:

a. \(\frac{5.18-10.27+15.36}{10.36-20.54+30.72}\)

dấu . là dấu nhân nha

Answer 1

\(\frac{5.18-10.27+15.36}{10.36-20.54+30.72}\)

\(=\frac{5.18-5.2.27+5.3.36}{10.36-10.2.54+10.3.72}\)

\(=\frac{5.18-5.54+5.108}{10.36-10.108+10.216}\)

\(=\frac{5.\left(18-54+108\right)}{10.\left(36-108+216\right)}\)

\(=\frac{5.72}{10.144}\)

\(=\frac{1.1}{2.2}\)

\(=\frac{1}{4}\)

Học tốt ❤⚽

Answer 2

\(=\frac{90-90.3+90.6}{90.4-90.12+90.24}=\frac{90.\left(1-3+6\right)}{90\left(4-12+24\right)}=\frac{4}{16}=\frac{1}{4}\)