=\(\frac{8.12+8.8-8.18}{8.10-8.9}\)
=\(\frac{8.\left(12+8-18\right)}{8\left(10-9\right)}\)
=\(\frac{8.2}{8}\)
=2
Các câu hỏi tương tự
tính nhanh:
\(\frac{1\cdot2\cdot3+2\cdot4\cdot6+3\cdot6\cdot9+4\cdot8\cdot12}{1\cdot3\cdot4+4\cdot6\cdot8+6\cdot9\cdot12+8\cdot12\cdot16}\)
dấu \(\cdot\)là dấu nhân nha!
A=\(\frac{1\cdot2\cdot3+2\cdot4\cdot6+4\cdot8\cdot12+8\cdot16\cdot24}{2\cdot2\cdot4+4\cdot6\cdot8+8\cdot12\cdot16+16\cdot24\cdot32}\)
A=
\(\dfrac{1\cdot2\cdot4+2\cdot4\cdot8+4\cdot8\cdot16+8\cdot16\cdot32}{1\cdot3\cdot4+2\cdot6\cdot8+4\cdot12\cdot16+8\cdot24\cdot32}\). dấu . là nhân .mọi ng cho m các phép tính cụ thể ạ.
\(S=\frac{1}{2\cdot2}+\frac{1}{3\cdot3}+\frac{1}{4\cdot4}+\frac{1}{5\cdot5}+\frac{1}{6\cdot6}+\frac{1}{7\cdot7}+\frac{1}{8\cdot8}+\frac{1}{9\cdot9}\)
HÃY CHỨNG MINH \(\frac{2}{5}< S< \frac{7}{8}\)
\(A=\frac{1}{2\cdot2}+\frac{1}{3\cdot3}+\frac{1}{4\cdot4}+\frac{1}{5\cdot5}+\frac{1}{6\cdot6}+\frac{1}{7\cdot7}+\frac{1}{8\cdot8}+\frac{1}{9\cdot9}\)
HÃY CHỨNG MINH :
\(\frac{2}{5}< A< \frac{8}{9}\)
\(A=\frac{1}{2\cdot2}+\frac{1}{3\cdot3}+\frac{1}{4\cdot4}+\frac{1}{5\cdot5}+\frac{1}{6\cdot6}+\frac{1}{7\cdot7}+\frac{1}{8\cdot8}+\frac{1}{9\cdot9}\)
HÃY CHỨNG MINH \(\frac{2}{5}< S< \frac{7}{8}\)
Tính nhanh:
\(\frac{126\cdot14\cdot12\cdot148\cdot333\cdot15}{74\cdot21\cdot9\cdot37\cdot8\cdot16\cdot18}\)
Giải nhanh hộ mik nha!!
\(B=\frac{2\cdot4+2\cdot4\cdot8+4\cdot8\cdot16+8\cdot16\cdot32}{3\cdot4+2\cdot6\cdot8+4\cdot12\cdot16+8\cdot24\cdot32}\)
\(\frac{32\cdot4+78\cdot2-7\cdot12}{7\cdot8+18\cdot2-26\cdot2}\)